A concern troll is a false flag pseudonym created by a user whose actual point of view is opposed to the one that the user claims to hold. The concern troll posts in Web forums devoted to its declared point of view and attempts to sway the group's actions or opinions while claiming to share their goals, but with professed "concerns". The goal is to sow fear, uncertainty and doubt within the group.
An example of this occurred in 2006 when Tad Furtado, a staffer for then-Congressman Charles Bass (R-NH), was caught posing as a "concerned" supporter of Bass' opponent, Democrat Paul Hodes, on several liberal New Hampshire blogs, using the pseudonyms "IndieNH" or "IndyNH". "IndyNH" expressed concern that Democrats might just be wasting their time or money on Hodes, because Bass was unbeatable. Hodes eventually won the election.
Although the term "concern troll" originated in discussions of online behavior, it now sees increasing use to describe similar behaviors that take place offline. For example, James Wolcott of Vanity Fair accused a conservative New York Daily News columnist of "concern troll" behavior in his efforts to downplay the Mark Foley scandal. Wolcott links what he calls concern trolls to what Saul Alinsky calls "Do-Nothings", giving a long quote from Alinsky on the Do-Nothings' method and effects:
These Do-Nothings profess a commitment to social change for ideals of justice, equality, and opportunity, and then abstain from and discourage all effective action for change. They are known by their brand, 'I agree with your ends but not your means.'
The Hill published an op-ed piece by Markos Moulitsas of the liberal blog Daily Kos titled "Dems: Ignore 'Concern Trolls'". The concern trolls in question were not Internet participants; they were Republicans offering public advice and warnings to the Democrats. The author defines "concern trolling" as "offering a poisoned apple in the form of advice to political opponents that, if taken, would harm the recipient".