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Twitter co-founder to cut role, focus on Square

Twitter co-founder Jack Dorsey said Tuesday he has turned over most operations at the high-flying company as he devotes more time to his other venture, mobile payments firm Square.

Teens turn from Facebook to fresher social-media sites

Facebook appears to have competition for teens' attention, and they're drifting to other social-media sites as evidence mounts that the growth of the world's largest social network is slowing.

NY tech fest heralds Silicon Valley of the East

The Big Apple may not have California's weather, but tech fans at New York Internet Week say that in every other way the city is on course to become Silicon Valley 2.0.

US sex publisher sues Tumblr over copyright

A US sex publisher which fought a long copyright battle with Google has sued the Tumblr social networking site claiming "rampant" illegal use of its photographs, court documents showed.

Obama joins Google+

Google+, the Internet search giant's rival to Facebook, has a high-profile new member: US President Barack Obama.

Obama campaign takes to Tumblr

US President Barack Obama added popular microblogging platform Tumblr on Monday to the Internet arsenal for his 2012 re-election campaign.

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