Yahoo has launched Mash as a beta version (by invitation only) this weekend. It's (yet another) social networkig site that appears to be aimed at unseating Facebook, and their biggest differentiator is a wiki-like approach where people can edit each other's profiles. More importantly, you can create a new profile for somebody else and then inite them to 'claim' that profile and make it theirs. Hmmmm, I'm not sure that I really like that idea. Friends writing on my wall in Facebook is one thing, but having them edit my profile?!