知乎

Zhihu functions similarly to Quora, where users may submit questions and answers, as well as upvote the best answer. Zhihu also features expert panels and daily and weekly newsletters. Initially, user registration was primarily invitation-only, with referrals needed from a couple hundred registered users. Otherwise, new users had to apply to join by filling in a large amount of personal information and waiting for a reply. Zhihu sought to host professional questions and answers, and then over time attract a more general community.