reddit和4chan都明文禁止concern trolling行为
A concern troll is a person who participates in a debate posing as an actual
or potential ally who simply has some concerns they need answered before
they will ally themselves with a cause. In reality they are a critic.
mitbbs上的troll都是些刚从法拉盛领完工资的政庇，玩的都是英文论坛上玩剩下的，
拉低了华人的平均智力。
