The title should say "Student falsely IDed by Reddit and 4chan"...
I will never understand why it's acceptable to talk about the actions of a small percentage of a user base as if they represent the entire group.
Because if the group tolerates it, and is known to do that kind of thing frequently, they DO represent it.
Or is it more accurate to say "the subreddit /r/findthebostonbombers of the Reddit web site did 'X'"?
I would argue for the latter. Granted, the mainstream media is unlikely to make the distinction or care, but it's an important difference.