In an offline setting, I typically click with people because we either share the same sense of humor, there's some kind of physical attraction, or we have a similar way of looking at the world/approaching problem solving. I typically click best with easy-going people; intense folks I can take in small doses or when I'm in the right mood.
Interestingly enough, this seems to be the opposite with people I've met online. I think its because you get to the root of the person much quicker online than you do in real life. It bothers me when I don't know what the other person's deal is and I don't know what strategy to adopt with them and intensity can be mistaken for many, many things in real life. Online, though, most people seem to be more comfortable to be themselves and you get to see another side of them that they normally wouldn't show if I met them face-to-face for the first time.
Perpetually easy-going folks online, on the other hand, tend to be chameleons. You don't know what the heck is going on with them because they're here to just have fun and laughing at the same meme isn't exactly that much of a bonding experience.
Hmm.
P.S: All Hail to The Discussion Queen, [MENTION=1669]Rite[/MENTION]!