@Ron Community is really something that you choose to make yourself by choosing who you read, respond to, and link to as well as how considerately you do those things. In its early days Twitter was a fine community primarily because it too was small. Once it reached massive scale it's much harder to keep the bad element out and Twitter compounds the problem with some of their design choices and what their algorithms force into their users' view in search of clicks and ad revenue. Eventually micro.blog will also face some of the same scale problems and have similar issues as well. Hopefully the subtle decisions they're making now will help to mitigate those problems, but they  too will eventually happen.

In the end, I think that having more powerful readers that give their users options for who and what to follow along with the ability to better filter, sort, and even rank the content they choose to see will help us all build the communities we want to be members of.