I think another thing is the size mixed with the stability of the community. Where you can 'know' someone and have multiple interactions. In larger communities

I think another thing is the size mixed with the stability of the community. Where you can 'know' someone and have multiple interactions. In larger communities where the people are less real a think I've seen a lot is the arguments become archetypal instead of actual exchanges, people tend towards arguing at a strawman they believe the other person represents.