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A computer programmer, startled by a helicopter clattering above his quiet Pakistani town in the early hours of the morning Monday, did what any social-media addict would do: he began sending messages to the social networking site Twitter.

Twitter has released a slew of statistics in recent months, from how many tweets are sent per day to the number of accounts created per day.Here's another one that's been more elusive: the number of users Twitter actually has.

The Wall Street Journal reported Monday that Twitter is in talks to buy TweetDeck, the popular Web and mobile app generally associated with Twitter power users.

Obama set the 'gold standard' for use of social media, and now it's an absolute must for candidates.Four years ago, Barack Obama kicked off his presidential campaign on the steps of Illinois' Old State Capitol, speaking in front of thousands of supporters and a throng of media.

How Twitter's owners and top executives say Twitter was founded is different than how Twitter was actually founded. Mainly, the official version leaves out the role of a major cofounder. Some early Twitter investors also wonder if it also leaves out a scandal.

UberMedia, which owns several popular applications that interface with Twitter, is outlining plans to build a social network that could compete with that popular microblogging platform, said three people who were briefed on the plans.

The U.S. government's new system to replace the five color-coded terror alerts will have two levels of warnings - elevated and imminent - that will be relayed to the public only under certain circumstances for limited periods of time, sometimes using Facebook and Twitter, according to a draft Homeland Security Department plan obtained by The Associated Press....

Twitter co-founder and former CEO Jack Dorsey said he is returning to the fast-growing company as head of product and executive chairman.

Twitter Co-Founder Biz Stone will become a "social impact" strategic adviser for AOL, as part of its broader integration with online news site the Huffington Post. He will stay at Twitter.

Anonymous, a hacker group sympathetic to WikiLeaks, plans to release e-mails obtained from Bank of America Corp early Monday morning, according to posts on the group's Twitter feed.