Ouch. It appears Plaxo was attempting to expand their Pulse service by crosslinking data from Facebook users with their Plaxo ID's. Unfortunately, they chose to do this without Facebook's OK, and used an utility to "screenscrape" Facebook. Facebook was, understandably, a bit miffed and responded by banning the users of this new Plaxo service from Facebook, including noted journalist Robert Scoble. Ouch.