A BlackBerry Forums member, while poking around Facebook security settings on their PC, came across a setting for Facebook for BlackBerry Smartphones which enables you to login to Facebook Chat. We aren’t sure how long that setting has been their, however, we are sure that it hasn’t always been there.
Facebook for BlackBerry Smartphones 1.8 is currently in closed beta. We haven’t heard Facebook Chat being part of the beta, however, we wonder if maybe Facebook Chat will be added to 1.8 before it is officially released.