facebook

Facebook.
Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc. As of January 2011, Facebook has more than 600 million active users. Users may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile. Facebook users must register before using the site. Additionally, users may join common-interest user groups, organized by workplace, school or college, or other characteristics. The name of the service stems from the colloquial name for the book given to students at the start of the academic year by university administrations in the United States to help students get to know each other better. Facebook allows any users who declare themselves to be at least 13 years old to become registered users of the website.
Facebook was founded by Mark Zuckerberg with his college roommates and fellow computer science students Eduardo Saverin, Dustin Moskovitz and Chris Hughes. The website's membership was initially limited by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and Stanford University. It gradually added support for students at various other universities before opening to high school students, and, finally, to anyone aged 13 and over, but based on ConsumersReports.org on May 2011, there are 7.5 million children under 13 with accounts, violating the site's terms.
A January 2009 Compete.com study ranked Facebook as the most used social networking service by worldwide monthly active users, followed by MySpace. Entertainment Weekly included the site on its end-of-the-decade "best-of" list, saying, "How on earth did we stalk our exes, remember our co-workers' birthdays, bug our friends, and play a rousing game of Scrabulous before Facebook?"Quantcast estimates Facebook has 138.9 million monthly unique U.S. visitors in May 2011.According to Social Media Today, in April 2010 an estimated 41.6% of the U.S. population had a Facebook account.

History
Main articles: History of Facebook and Timeline of Facebook
Mark Zuckerberg wrote Facemash, the predecessor to Facebook, on October 28, 2003, while attending Harvard as a sophomore. According to The Harvard Crimson, the site was comparable to Hot or Not, and "used photos compiled from the online facebooks of nine houses, placing two next to each other at a time and asking users to choose the 'hotter' person"
To accomplish this, Zuckerberg hacked into the protected areas of Harvard's computer network and copied the houses' private dormitory ID images. Harvard at that time did not have a student "facebook" (a directory with photos and basic information). Facemash attracted 450 visitors and 22,000 photo-views in its first four hours online.
The site was quickly forwarded to several campus group list-servers, but was shut down a few days later by the Harvard administration. Zuckerberg was charged by the administration with breach of security, violating copyrights, and violating individual privacy, and faced expulsion. Ultimately, however, the charges were dropped. Zuckerberg expanded on this initial project that semester by creating a social study tool ahead of an art history final, by uploading 500 Augustan images to a website, with one image per page along with a comment section.He opened the site up to his classmates, and people started sharing their notes.
The following semester, Zuckerberg began writing code for a new website in January 2004. He was inspired, he said, by an editorial in The Harvard Crimson about the Facemash incident. On February 4, 2004, Zuckerberg launched "Thefacebook", originally located at thefacebook.com.
Six days after the site launched, three Harvard seniors, Cameron Winklevoss, Tyler Winklevoss, and Divya Narendra, accused Zuckerberg of intentionally misleading them into believing he would help them build a social network called HarvardConnection.com, while he was instead using their ideas to build a competing product. The three complained to the Harvard Crimson, and the newspaper began an investigation. The three later filed a lawsuit against Zuckerberg, subsequently settling.
Membership was initially restricted to students of Harvard College, and within the first month, more than half the undergraduate population at Harvard was registered on the service. Eduardo Saverin (business aspects), Dustin Moskovitz (programmer), Andrew McCollum (graphic artist), and Chris Hughes soon joined Zuckerberg to help promote the website. In March 2004, Facebook expanded to Stanford, Columbia, and Yale. It soon opened to the other Ivy League schools, Boston University, New York University, MIT, and gradually most universities in Canada and the United States.
Facebook incorporated in the summer of 2004, and the entrepreneur Sean Parker, who had been informally advising Zuckerberg, became the company's president. In June 2004, Facebook moved its base of operations to Palo Alto, California. It received its first investment later that month from PayPal co-founder Peter Thiel. The company dropped The from its name after purchasing the domain name facebook.com in 2005 for $200,000.
Facebook launched a high-school version in September 2005, which Zuckerberg called the next logical step.At that time, high-school networks required an invitation to join. Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. and Microsoft. Facebook was then opened on September 26, 2006, to everyone of age 13 and older with a valid email address.
On October 24, 2007, Microsoft announced that it had purchased a 1.6% share of Facebook for $240 million, giving Facebook a total implied value of around $15 billion. Microsoft's purchase included rights to place international ads on Facebook. In October 2008, Facebook announced that it would set up its international headquarters in Dublin, Ireland. In September 2009, Facebook said that it had turned cash-flow positive for the first time. In November 2010, based on SecondMarket Inc., an exchange for shares of privately held companies, Facebook's value was $41 billion (slightly surpassing eBay's) and it became the third largest US web company after Google and Amazon. Facebook has been identified as a possible candidate for an IPO by 2013.
Traffic to Facebook increased steadily after 2009. More people visited Facebook than Google for the week ending March 13, 2010.
In March 2011 it was reported that Facebook removes approximately 20,000 profiles from the site every day for various infractions, including spam, inappropriate content and underage use, as part of its efforts to boost cyber security.
In early 2011, Facebook announced plans to move to its new headquarters, the former Sun Microsystems campus in Menlo Park, California.

Twitter

Twitter is a website owned and operated by Twitter Inc.., which offers a Micro-blogging social network that allows users to send and read messages are called tweets. Tweets are text posts to 140 characters are displayed on the user profile pages. Tweets can be seen outside, but the sender can restrict delivery of messages to their friends list only. Users can see the tweets of other writers known as followers.

All users can send and receive tweets via Twitter site, compatible external applications (mobile phones), or with a short message (SMS) available in certain countries. This site is based in San Bruno, California near San Francisco, where the site was first created. Twitter also has a server and an office in San Antonio, Texas and Boston, Massachusetts.

Since established in 2006 by Jack Dorsey, Twitter has gained popularity worldwide and currently has more than 100 million users. This is sometimes described as "SMS from the internet"
Already more than 400,000 tweets posted per quarter in 2007. Then developed menjad 100 million tweets posted per quarter in 2008. At the end of 2009, 2 billion per quarter tweets are posted. In the first quarter of 2010, 4 billion tweets are posted. In February 2010 Twitter users send 50 million tweets per day. In June 2010, approximately 65 million tweets are posted every day, equivalent to about 750 tweets are sent every second, according to Twitter.


Twitter users will become more active when there is a notable event. For example, the record created at the 2010 World Cup, when fans write in 2940 tweets per second in the second period 30 after Japan scored a goal against Cameroon on June 14, 2010. Records were broken again when the 3085 tweets per second that are posted after winning the Los Angeles Lakers in NBA Finals 2010 on June 17, 2010. This also happens when the singer Michael Jackson died on June 25, 2009, the server is down because of Twitter users update their status to include the words "Michael Jackson" on the level of 100 000 tweets per hour.
Content In Twitter
Home
On the main page we can see the tweets are sent by people who become our friends. Also on this main page
Profile
on this page to be viewed by all persons on the profile or the data themselves and the tweet that has been posted.
Follower
Followers are other users who want to make us as friends. When other users into account one's followers, then follow the tweets someone he will enter into the main page.
Following
The opposite of a follower, someone Following is the account that follows another user account for tweets sent by people who followed it into the main page.
Mentions
Usually, this content is the reply from the conversation to fellow users can simply mark the person who will be invited to speak.
Favorite
Tweets marked as a favorite for not missing the previous page.
Direct Message
More direct message function can be called SMS for sending messages directly between users without any other users who can see the message except the user who sent the message.
Hashtag
marker is written in front of a particular topic for other users can find similar topics written by others as well
List
Following twitter users can group them into one group or list. making it easier to be able to see the whole of the username that they follow
Trending Topic
the topic being discussed many many users in a same time
Contents Tweet
Contents Tweets by Pear Analytics.
• News
• Spam
• self-promotion
• Celoteh does not mean
• Conversation
• Pass-along value

teenager and social network

From behind their bedroom doors, more than 1 out of every 10 teenagers has posted a nude or seminude picture of themselves or others online - a "digital tattoo" that could haunt them for the rest of their lives, according to a poll being released today.

Aside from the nudity, the survey also found that at least a quarter of the young people polled had posted something they later regretted, made fun of others or created a false identity online.

While teens are spending more and more time on social networking sites like Facebook and MySpace - with 22 percent saying they check their sites more than 10 times a day - they don't seem to be aware of the long-term personal havoc they could create with a click of a button.

what their children are up to, the poll found.

"We've got to stop kidding ourselves about this," said James Steyer, chief economic officer and founder of San Francisco-based Common Sense Media, which commissioned the study. "There are enormous consequences from inappropriate behavior online."

The survey polled 1,000 teens and 1,000 parents to gauge how much time young people are spending on social-networking sites, what they do when they're on them - and whether their parents know.

When Maxwell Wallace, a graduate of Lowell High School in San Francisco, wanted to know more about his new roommate at Georgetown University this fall, he didn't just place a phone call. He also went to Facebook.

There, Wallace could read the teen's thoughts, see what his interests were, what his friends said about him and what his pictures indicated about his lifestyle. It was "a better look at who I'm going to be living with for the next eight to nine months," he said.

Teenagers don't always self-censor online; they may bully classmates, for example, or post risque photos of themselves or their peers.

"If you're not in the same place as the person, it just feels less personal; it's easier to do mean things," Steyer said. "It's almost simulated behavior. You can be risky and do riskier things in a digital context."

Yet there can be enormous consequences.

That alcohol-related post-prom picture? Someday an employer or college admission officer might come across it with a quick click on Google. Hitting delete to get rid of a questionable photo won't help. The digital imprint never goes away and could be flitting across computer screens around the world.

"Look, whether we like it or not, kids live in the 24/7 digital world," Steyer said. "It affects virtually every aspect of their lives."

It's a "playground with no parental supervision," said Dr. Dimitri A. Christakis, George Adkins Professor of Pediatrics at the University of Washington, who found in a study released earlier this year that 54 percent of teens demonstrate risky behavior online.

Just 4 percent of parents said their children check their sites more than 10 times a day, and only 2 percent said their teens have posted naked pictures, according to the poll released today.

"There's definitely not-my-kid syndrome," Steyer said.

San Francisco parent Michael Wise worries about his kids' online social networking.

"What worries me the most is that kids will give out information that should be kept private, thinking they may be doing so privately," said Wise, the father of three, including two teenage boys.

That information could include their address, phone number or when the family will be taking a long vacation.

"People forget that everything they say online is a public postcard," Wise said.

Georgetown-bound Wallace acknowledged that his peers aren't always smart about what they put online. Yet teens have always done silly or stupid things, he said. In the past, folks could just burn the negatives.

"Technology doesn't create new behaviors, it just may exploit them," he added.

Instead of worrying about the technology, adults and teens should focus on the underlying behaviors like bullying and binge drinking, Wallace said. He added that social-networking sites can be valuable, providing support and community - positive factors in a teenager's life.

But, he conceded, "it's definitely bad to put naked pictures of you online."

Teen social networking by the numbers

51 Percentage of teens who check their sites more than once a day.

22 Percentage who check their sites more than 10 times a day.

39 Percentage who have posted something they later regretted.

37 Percentage who have used the sites to make fun of other students.

25 Percentage who have created a profile with a false identity.

24 Percentage who have hacked into someone else's social networking account.

13 Percentage who have posted nude or seminude pictures or videos of themselves or others online.

-- For the full report, go to www.commonsensemedia.org.