From Zuck (Thursday, January 10, 2013 1:28AM)
Subject: Re:Competitive Mobile App Install Ads
"I think we should block WeChat, Kakao and Line ads.Those companies are trying to build social networks and replace us.The revenue is immaterial to us compared to any risk.
And I agree we should use ads to promote our own products, but I'd still block companies that compete with our core from gaining any advantage from us. I'd also keep blockingGoogle but otherwise wouldn't extend the block to anyone else."