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University of California sues Facebook for patent infringement

Twitter officially unveils more-restrictive API

Facebook cleanses pages of fraudulent "Likes"

videoPatent wrangles and Twitter strangles

Twitter appeals court ruling to turn over user information

TechHive: Updates to iOS Facebook app offers plenty to like

techhive.com

On Thursday, the company announced that it had rewritten its Facebook app for iPhone and iPad from the ground-up.

Facebook gets FTC clearance for Instagram acquisition

Twitter app makers trying to figure out the future

Twitter hands down new, strict rules for third-party developers

Instagram updates iOS app with Photo Maps, more

Pinterest goes all-in with mobile, releasing iPad and iPhone apps