So it’s sort of cool that twitter is not adding rel=”nofollow” to the links that you put in your tweets. And since everyone has a public page on twitter, those links get followed by google (and others). The bad part is that you can’t specify the text for the link (at least, not that I know of), but the good part is that you can add links to things you want to go up in search rankings ;)
However – with only 140 characters, many people are using url abbreviation services (tinyURL), which redirect to pages. And SEO conultants, at least, say that the tinyURL service is returning a 301 (permanently moved) header. I guess google will follow that, too, but it’s not quite as direct. I’m not sure what the other services return. This would be cool to check up on.