Following the controversial Barcelona - Chelsea clash on Wednesday, a number of hate groups have sprouted on the popular social networking site.

Chelsea supporters are up in arms over some rather disastrous refereeing by Norwegian Tom Henning Ovrebo. Truth be told, they rightfully have a bone to pick. Ovrebo's performance truly was horrible, and he practically denied Chelsea the UEFA Champions League finals single handedly.

Although most Facebook groups dealing with the subject feature emotional, sad, yet non-violent comments, there are a few that stick out. For example, "I Hate Tom Ovrebo," "Tom Ovrebo Must Die," "Kill Tom Henning Ovrebo," and my personal favourite "We group dedicated to the hunt for (and brutal murdering of) the second-leg champions league ref of Chelsea vs Barcelona."

The Norwegian police says it's taking the threats seriously. Not sure what they can do about it, as it seems half of Europe wants the poor man dead.

More here.