the difference
I think the big difference between Yerdle and the other sharing/selling sites mentioned is that Yerdle seeks to share and sell through your social network. It feels good to give things away but it feels even better when you know and like the people to whom you're giving. Plus, buying or receiving free stuff from your friends feels safer because you assume they wouldn't give you junk or bedbugs, AND they won't assault you when you meet. As a woman, I know I always worry a little when I drive to a strangers' house to pick up something I found on CL.
I use my Facebook account to ask for or offer things a few times a month but I don't want to do it too much lest my friends tire of it. I look forward to trying Yerdle if it ever makes it eastward so I can get down to sharing a lot more.