I looked through some of the #facebook documents that leaked recently from the #Six4Three claim. They contain emails between FB execs. I followed one of the email chains and found an interesting dynamic pertaining to banning competitors from advertising on facebook...
David Fischer (Advertising Chief) says, "We should be secure enough in the quality of our products to enable them to compete effectively in the open marketplace". Mike Schroepfer @schrep & Mike Verna @mvernal agree with David...
Zuckerberg misses the point and responds, "I think we should block WeChat, Kakaoand Line ads. Those companies are trying to build social networks and replace us. The revenue is immaterial to us compared to any risk"