We're either shady, stuck up, flirts, desperate, or screen watchers. Maybe a combination of two or more characters. Which creates and turn others into trolls.
Shady people: they like to observe and tend keep their personal shit to themselves. They have trust issues and hardly invest in "friends". Sometimes they're too good to talk to just anyone and wait for "cool" people to get on. Open up a little and not all "cool" people are worthy of your time investment.