a different sort of tree

I received an e-mail on my uni account today telling me of yet another potential distraction, as if there weren't already enough things on-line to keep us from working. Another networking toy, this one about academia set up as a "tree" (an appropriate week to hear about it, given all the trees we've been discussing on the geo-blog sphere recently) linking all universities/researchers. While there are thousands of people on it already (including some rather famous ones), there doesn't seem to be all that many geologists yet, so I thought I'd mention it here and see if any of the rest of the geobloggers want to play.