Social Media Saturday: Facebook Culls the App Herd, Twitter Had a Bad Week on Wall Street, and Whisper CEO's Contentious Debate Over Gwyneth Paltrow

This week in social media, Twitter got pretty bruised by Wall Street, Facebook bought a fitness app and got rid of a couple of its less popular mobile offerings, and Whisper's CEO Michael Heyward duked it out with TechCrunch's Michael Arrington. Meanwhile, Tumblr added a huge swath of customization options to its mobile app and the Federal Trade Commission officially chided Snapchat. It's time for Social Media Saturday!
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