Specifically, Places is available as part of Facebook for BlackBerry 1.9, which is now available in the BlackBerry App World and will be issued as an update to existing users over the next 24 hours.
Here's a rundown of the Facebook Places features that are now available to BlackBerry users:
Check in to Facebook Places within a 1.25 mile radius of your location
Select a Place from the available Nearby Places or add a Place if your location isn't already in the database
Tag friends upon checkin
View the Places your friends have checked in
"Like" or add comments to a checkin
Checkins show up in the news feed
Integrates with GPS and BB Maps
Just a few weeks ago, BlackBerry rolled out a fresh coat of paint on its Facebook app, adding some new features like integrated search, better friends list views and an updated UI. Now that Facebook Places support is also built-in, the app more closely rivals those available for other mobile platforms.