>In cooperation with internet censorship in China, Sina sets strict controls over the posts on its services.[57][58] Posts with links using some URL shortening services (including Google's
goo.gl), or containing blacklisted keywords,[59][60] are not allowed on Sina Weibo. Posts on politically sensitive topics are deleted after manual checking. Users with few followers may be able to post on censored topics with relative freedom until they reach a critical mass of followers, which triggers enforced content supervision.[61]