Everything is organized around coins and projects. For example if you are into eth core then you are in eth magicians https://ethereum-magicians.org

The most popular crypto mediums are telegram and discord. Twitter is the social media of choice. Reddit has some decent subreddits but it isn’t the primary place.

This community is based on trust. Trust is earned through contributing code, knowledge, effort, etc. If you join in the bull market, stick around through the bear to show you are serious. Etc.