Its reported that Localeze and Facebook has struck a deal to roll out their Facebook Places area in the near future. Similiar to Twitter Places.
Essentially, what we're hearing is that Facebook will use this data to populate some new kind of fan pages for places, that businesses will be able to then claim on the network. The code (now removed) on Facebook's mobile site pointed to a previously unseen Places tab coming to Facebook. That code also pointed to some check-in functionality coming to Facebook — obviously, that has yet to show up on the service.