I guess all those Social networking websites(MySpace,Orkut etc) can be involved here.If these sort of questions pique your interest.I'd suggest you take a look a the Chinese market. It can be treated as a parallel universe where apps/companies develop under different restrictions which brings about a unique ecosystem for the user. This is an interesting example [1].

[1]:http://a16z.com/2015/08/06/wechat-china-mobile-first/