I'm always amazed at how some folks think social media is some kind of panacea. I've just never seen how 15 tweets per day = unlimited potential. Sure, you could tweet all the time and eventually you'll get noticed, but who has time for that?
I'm just not seeing much added value for most professions. Sure, it's fun to use and you might interact w/ cool folks, but outside of that, what can you do there that you can't do normally?