If your online community has accounts on dozens of social-media platforms, you have a lot of distractions.
If you don’t have a strong reason to register a MySpace account, don’t do it. Every new account must add something valuable that your community wants.
For example, if members of your community have a lot of pictures to share pictures, create a community Flickr account. But find someone to run it.
You will need someone that keeps people updated about new pictures
and picks out a selection of the best each week for the community to
see. Someone that stimulates discussions about pictures and will
happily put together a team of people to tag the pictures properly.
Otherwise, single-mindedly focus your efforts on developing a concentrated community.