I can't say that I spend much time on the site. Like I've mentioned before, I'm addicted to twitter, and will spend much more time polling and microblogging on there. Twitter takes little time to keep up with, and I'vealmost abandoned facebook and linkedin because I don't have the timeduring work to check them. However, I do think linkedin is great for a professional profile, and I use it as such. Gotta work on getting those recommendations though!