how do 你 know when a group's been deleted?does it just not 显示 up when 你 research it???? O_O

Depends if the club as been properly keyworded 或者 not. If the club hasn't been keyworded then it won't 显示 up when 你 搜索 anyway.

But if 你 could previously find it 由 searching and then all of a sudden 你 can't anymore, then it will have been deleted.

你 should check your 俱乐部 too, just to make sure.