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Activists allege Facebook dragging its feet on privacy changes

Tweet Marker Plus brings Web interface, optimized search

Four answers to common Facebook Timeline questions

Google enables third-party apps in video Hangouts

Twitter acquires blogging platform Posterous

Yahoo sues Facebook over 10 patents

Facebook adds Interest Lists, steps up rivalry with Twitter

FourSquare drops Google Maps API for OpenStreetMap

Getting started with the new Facebook Business Pages

Yahoo, Facebook in intellectual property dispute