Sina Weibo and companies. Also, there is a graph and a declaration on its user page to show the verification. There are several kinds of verifications: personal verification, college verification, organization verification, verification for official accounts (accounts of government departments, social media platforms and famous companies) weibo master (people bind the accounts with their phone numbers and their followers). When the number of microblogs reaches a threshold, users can apply for the verification of "Weibo Master". Sina produced mobile applications for various platforms to access Sina Weibo, the platforms include Android, BlackBerry OS, iOS, Symbian S60, Windows Mobile and Windows Phone. Sina
Microblogging in China instant messaging service QQ's users, Tencent Weibo later attracted more registered users than Sohu Weibo and NetEase Weibo. The public beta versions of NetEase Weibo and Sohu Weibo were launched on March 20 and April 7, 2010, respectively. All these weibos, provided by the Chinese Internet giants, used the subdomain "t.example.com", such as t.sina.com.cn for Sina Weibo, t.qq.com for Tencent Weibo, t.sohu.com for Sohu Weibo, t.163.com for NetEase Weibo. On 7 April 2011, the leader of the weibo services Sina Weibo started to use an independent domain name weibo.com acquired earlier, in an attempt to build up its own brand.