I'm on Twitter as MacguffinGames. I think Twitter in general is a great outlet - not only for marketing/PR for your company, but for personal networking and just staying sane running a one-person show.
I'd recommend checking out TweetDeck as well - those are the main two apps people seem to use, not including platform specific ones for iPhone, Blackberry, etc.


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But I think it can also be a pretty powerful marketing and networking tool.