There are many apps like this for Android and iPhone. Why not for BlackBerry?? Its for fun, promoting own place or using it inside of a building if gps does not work.. whatever.
Posted from my CrackBerry at wapforums.crackberry.com
Of course you can add new places to your recent location. You are in Los Angeles and add a place "Hawaii", haha.
There are facebook apps called "my places" or "place anywhere" and you can check-in anywhere at your pc. But on the wall is written "via my places" etc.
You can check-in anywhere as well with firefox and the add-on "geolocator" and using m.facebook.com (via Mobile Web)
Check-in via BlackBerry is just possible with the BlackBerry simulator, there you can change the geolocation.
Posted from my CrackBerry at wapforums.crackberry.com