I gave bits of MSC out for people who wrote blog posts, changed their forum signature, or otherwise made some good-faith effort to promote the project. I would suggest continuing the model where you have to at least tweet about MSC to qualify for some.
High powered tweets are still only worth a fraction of one MSC. I'd say someone who has the capacity to produce excellent press release bits which attract the attention of journalists. And still further, for intelligent people to talk to those journalists in a fashion which results in a news story of good quality. If someone manages to a Wall Street Journal writer to cover MSC it should be worth 10 or 20 MSC.