>Armchair psychology? No, I've made many friends and acquaintances, both online and in real life. The ones that bubble around posting online heavily, have developed antisocial tendencies that were reinforced through social exclusion. A self-fulfilling prophecy. I know this, because I know those people well and because I was there at one point in my life as well.

This would still qualify as anecdotal data, and thus armchair psychology. Now, it works perfectly valid as a hypothesis and can be rigorously tested and determined if data reject or supports (fails to reject) it. But without peer reviewed research, that last step hasn't happened.

It also sounds good. Makes sense. Fits our notion of common sense of how humans works. The problem is that psychology is filled with examples of where these kinds of intuitions are wrong.