Senh: I've already been seeing some of that in action. I've noticed that the results I get when I'm logged-in are different from the results I get when I'm not. Sometimes, I get results from sites that I'm Plus One-ed on. Sometimes I get results from sites that I visit often, like MoviesWithButter.com, for instance.
Senh: Rupert Murdoch has a Twitter account! I wonder if he has a MySpace account. I also wonder if this means anything else - i.e. that he's actually interested in the microblogging site.
Senh: Unless those media mentions can convert more people to using twitter, it's kind of a useless metric. It just means that Twitter's marketing department is doing a good job. Also, because writers tend to solicit users to follow them on Twitter, it makes it a more natural medium for them to use.