I agree, I don't think anyone I know uses facebook groups and many don't even know what they are. They might become fans of some product and post on a fan page, but that's not the same thing. I think part of the reason that Facebook overtook myspace was because of the user interface improvement and part of it is a non-quantifiable hotness factor that causes fads in society in general.
I think c++ is great to learn on, but I hate working with it day in and day out. It's also close enough to objective-C and also to C# that it's going to remain valuable to learn.
