They are going to Instagram though. Thats one of facebook smartest move. Buying all the other social media sites.
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Many new innovative companies are being founded in this space and those that are successful are richly rewarded (by selling to FB). The system is working exactly how it is supposed to.
US system is designed to be anti-markets and pro business, so you have a point. Good for startup, good for FB, bad for consumer and competition.
It's still against what anti-trust law was supposed to be.