Internet smart guys will often be found trolling broad discussion topics such as politics and science, but will not fail to comment on very specific specializations.
Common symptoms include, but are not limited to: terrible spelling and grammar, missing the point, limited citations (often from wikipedia), severe caps lock, and inability to handle disagreements.
Internet smart guy: LOL ARE YOU DUMB?
Innocent forum-goer: Do you have an argument?
Internet smart guy: WELL ACTUALY IM STUDYING CRIMINAL LAW FOR MY ASSOCIATES DEGREE SO THERE WOULDNT EVEN BE AN ARGUMENT LOL