[tim333]

Propagandists rather than trolls I think.

[bootboat]

I think they mean "concern troll" more specifically:

* http://www.urbandictionary.com/define.php?term=concern+troll

* http://en.wikipedia.org/wiki/Troll_(Internet)#Concern_troll

* http://en.wiktionary.org/wiki/concern_troll