Facebook is becoming Tecent QQ in US. (If you dont know abt Tecent QQ, please google it). It implements ideas from emerging companies and squeeze them out because they have the most important thing: 500 Million eyeballs.
Facebook is a business which has leverage and they are going to use it. Business is competitive thats the nature of the game. I can't get too pissed at Facebook, because Groupon and Foursquare will do try to squash smaller competitors as well - its the nature of swimming with sharks.