I think problem is more deep, I do not want to make other Conspiracy Theory but here some story from other huge Russian social network (vk 150m. users). There is one small, not that big group (like fb groups), users made agreement, that no one will post next day (something like honeypot), and those who post would be considered as bot and baned forever. So next day couple or so bots generated comments encouraging others do not go on strike against some political party [0].

I do not know is it applies to FB, but those who have like 100k bots have some power too.

[0] http://imgur.com/Vvkbx screenshot in russian

Edit: spelling Edit2: proper link