Criticism? The EFF comments were practically praising Facebook:

  From the outside, says Adi Kamdar, an activist with the Electronic Frontier
  Foundation, it seems Facebook is “doing a good job” anonymizing personal
  info as it seeks to link online and offline behavior. Facebook is adamant
  that its system can’t be cracked—i.e. can’t be used to match names from
  Facebook accounts with behavior off of Facebook—and Kamdar says he has no
  reason to believe otherwise.