Then of course, another reason to join is it takes a few moments and their profile will have an active link to your Web site. I have way more freebie accounts on various services than I'll ever have time to use because I figure free links never hurt traffic to at least my main Web site.
Interesting little tidbit for people wondering about how important links are.
I have a CafePress store that I link to on my main Website, and as soon as I started linking to it search engines started sending traffic. I usually get several visitors a day thanks to search engine traffic. Not enough, but I do get them!
I also have a generic CafePress store that I have not linked to on my main Website and I've had 1 search engine visitor in a week. I gotta start finding some freebie links for that store I guess.