My opinion is as valid as yours ( I assume you've used both too, and that you don't have prejudice against any of them). I'm not saying I'm right, I'm saying I feel that GitHub is far superior -- for my needs.
Some versions of bumblebee work here. Right now I run my own modified version and am actually scared of trying to update it. However, I have no UEFI startup manager. I am actually glad, because the thought of UEFI makes me want to puke.
Exactly. Skype uses an interface, it shouldn't adapt to webcams -- that paart of the implementation. As far as I know, most webcams out there are also supported implementation-side. What *could* happen is a misuse of the interface by Skype. For the record, I never had issues with my 4 webcams in skype, though I really don't videochat that much.