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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.

Cuba's Maximum Leader is also on top in cyberspace. Twitter account that tweets excerpts from former President Fidel Castro's frequent musings on world affairs has passed 100,000 followers - which the government says makes it the first official Cuban-themed Twitter account to break that threshold.

Long-form blogs were once the outlet of choice, but now sites like Facebook, Twitter and Tumblr are favored.

Twitter has reached nearly 200 million users who post 110 million tweets per day as of the January 1, 2011, Twitter spokesperson Carolyn Penner tells me. That’s up from 190 million users as of June 2010 and 95 million tweets per day as of early December — steady, but not explosive, growth. That’s why the company is now focused on building out its international presence.

A U.S. court has ordered Twitter to hand over details of the accounts of WikiLeaks and several supporters as part of a criminal investigation into the release of hundreds of thousands of confidential documents.

Apple Inc joined a growing number of U.S. corporations that have cut ties with WikiLeaks, removing an application from its online store that gave users access to the controversial website's content and Twitter feed because it violated guidelines.

Twitter has raised a big new round of venture capital, $200 million, valuing the company at $3.7 billion.

So many people love Justin Bieber. They love him so much, that this year Twitter changed the way it counts its most tweeted-about topics to effectively exclude him....