Go along to get along.
Ever wonder why you feel so good and confirmed when you are in a community and you become part of an echo chamber? Agreeing with someone else feels good.
And the more you agree, the more you attach and reinforce the echo chamber and the collective ideology.
This is a very good study and explains a lot about human activity - offline and online.
I think you will find this of great interest as we move more and more into social networks.