I think those would be easy to find. Most of the accounts will have locations of Chinese mainland and only post good things about China and bad thing about others. Some of them will post funny/beautiful photos/videos to gain following as well. Since Twitter is banned in PRC, why would people be constantly on VPN just to post this stuff. All you need to do is, find state sponsored account, see the users retweeting/liking their tweets like this account: https://mobile.twitter.com/eaglet_CH
There are accounts at a higher level than this, who would make more sense in countering and spread positivity as well.
