Facebook Video Chat for 10.8.2
I have tried downloading facebook videochat on all the different servers but NONE will work! Everytime I try to download it a window pops up saying ""FacebookVideoCalling_v1.6.jar" can't be opened because it is from an unidentified developer". Why is this happening? People I've asked seem to be able to use it with no problems.
MacBook Pro, OS X Mountain Lion (10.8.2)