JA WestenbergYour 'network' is a list of people who want something from you. Your 'community' is a list of people who will help you move a couch. Optimize for couch-movers.
william.maggosthere's social media and social networking. they overlap but mostly the former is public and for news/entertainment while the latter is private and composed of friends, family, neighbors and interest groups. the first is what old school twitter did well while Facebook is for the latter.
I get worried and confused when people use the term community for online stuff.