I think that to succeed in the social media world, a key concept is social density. I work towards this by constantly looking for new sites and services to maintain a presence on and being active in many different microblogging communities.
Mostly how the majority of us do it. Only we had to start the other way round and now things are a mess. Seriously though, this a nice description for those who would not come up with a "strategy" for this themselves. In that, it's a nice Be Social 101 guideline.