This week in social media, Pinterest emerged as a serious competitor in the social media industry. Meanwhile, Foursquare rolled out its new Swarm app, Yahoo bought a Snapchat clone called Blink, Snapchat itself was named one of the worst companies for data privacy, Twitter almost got banned in Russia, and Facebook tested a new location-based notification system that's a bit like Foursquare, with a little Google Now thrown in. It's time for Social Media Saturday!
