> My point is that Facebook and Google would've been the dominant actors on the Chinese market today, not Weibo, QQ and Baidu, if the CCP hadn't been actively working against the US companies.

To some degree I agree about this assertion, but you made some factual mistakes:

* The C2C (copy to China) relationship is Twitter -> Weibo, Facebook -> Renren and Google -> Baidu.

* QQ is an IM and the western equivalents MSN, Skype etc. were never banned in China. Also, QQ gained its popularity quite some before the GFW. I believe this is the most legitimate story where a Chinese product wins not due to GFW. Another such story is eBay vs. Taobao.