This also, critically, is a major step backwards for the wireless carriers like Verizon and AT&T, who have been wildly overcharging for voice service and text messaging for, well, pretty much ever. But if you can text by using data--like on iMessage, or BlackBerry Messenger, or GChat or Facebook Chat--and now make phone calls with Facebook? That's a huge knock for the carriers, who could find themselves turning quickly into mere flat-rate data providers. The way you pay Verizon or Comcast or Time Warner for your home internet, that could well be the way you pay for your phone service in the near future. Who needs minutes?