Eric Enge: Can you talk a little bit about Session IDs?
Matt Cutts: Don’t use them. In this day and age, most people should have a pretty good idea of ways to make a site that don’t require Session IDs. At this point, most software makers should be thinking about that, not just from a search engine point of view, but from a usability point of view as well. Users are more likely to click on links that look prettier, and they are more likely to remember URLs that look prettier.
If you can’t avoid them, however, Google does now offer a tool to deal with Session IDs. People do still have the ability, which they’ve had in Yahoo! for a while, to say if a URL parameter should be ignored, is useless, or doesn’t add value, they can rewrite it to the prettier URL. Google does offer that option, and it’s nice that we do. Some other search engines do as well, but if you can get by without Session IDs, that’s typically the best.