The document summarizes several examples of successful social media marketing campaigns: 1) Two Tarts Bakery grew sales 800% in 10 months through Facebook, events, Yelp, and gaining magazine/newspaper coverage. 2) Blendtec's viral YouTube videos showing blenders destroying items led to a 5-fold sales increase with low-cost, original videos. 3) Threadless engages its community on Facebook, Twitter, and YouTube to drive viral sharing and record sales in a down economy. 4) Burger King's "Sacrifice" Facebook app asking users to ditch friends for burgers went viral before being removed, gaining $50M in free publicity.