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Micro-blogging site Twitter is joining the ranks of Facebook and Google+ as it launches 'brand' pages as part of a service-wide redesign.

After the Obama campaign’s masterful use of social media in 2008, House Republicans have adopted Twitter as their karaoke microphone against the White House bullhorn.

Twitter CEO Dick Costolo says his company is now seeing almost 250 million tweets every day, up from 100 million at the beginning of 2011. That’s a billion tweets every four or five days. Costolo made the comments in an on-stage interview with John Battelle at the Web 2.0 Summit in San Francisco on Monday night.

The top campaign strategists for President Obama and Republican Mitt Romney are in a war of 140 characters or less, lobbing insults about each ...

Hacker group The Script Kiddies successfully hacked another news organization when it logged onto USA Today's Twitter page and posted false statements Sunday evening.

People with accounts on both Facebook and Twitter have been able to update them both simultaneously for a long time -- but from Twitter to Facebook, and not the other way around. That’s about to change.

Twitter CEO Dick Costolo, announced a list of interesting engagement stats, and then slipped in this tiny piece of information in an informal business meeting on Thursday morning that “Users will begin to observe promoted tweets from companies you don’t follow.”

Twitter has launched its own photo-sharing tool, offering a native version of a feature that until now was mostly the domain of third-party apps like Twitpic and yfrog.

Twitter said it received a "significant" round of funding led by Russian venture firm Digital Sky Technologies.

Are those who post unverified reports on Twitter playing an important role in the new ecosystem of news, or being irresponsible and indulging in gossip? That question goes to the heart of the idea of news as a process rather than a finished product.