ryboryan - 9:26 pm on May 6, 2011 (gmt 0)
Reading this makes me think about all the valuable meta-meta data to be found crawling twitter posts with links.
Webmasters are forced to condense words to 140 characters minus the short url.
A step further would be to measure what words and phrases are the readers/users of a site using for their own tweets that link to a website's content.
I'm sure this has all been discussed before, but I just realized it.
In regards to this thread's subject, I would assume any goals one has with twitter and backlinks would be nofollow-blocked.