1. Facebook gets more of people's personal info.
2. Only Facebook gets this info.
/cynicism
It's the perfect way for employers to find the best cultural fit quickly, and can even be a great conversation starter for interviews."
People like to paint Facebook as an antagonist who is working to degrade personal privacy, but really they are acting in their own interest of making money by providing a service that people want to use. Facebook is not working against you, it also isn't working for you.
This article [1] is imho quite right, this is mostly a non-issue turned into PR.
1:http://rexriepe.com/2012/clever-pr-facebook-bends-a-non-stor...
In the short term, the network effect holds their site together, unless they mess up really bad. In the long term, however, these things do matter and Facebook knows that.
It just so happens that "the right thing" happens to line up with Facebook's self-interest this time but I would not couch it as FB doing the right thing because it was the primary reason to do so.
Exposure to litigation, PR is a positive side effect.