"Common" can also refer to "the usual", but according to the numbers, the reasons are all over the place at around 5%.
English is annoyingly vague in this case. Perhaps there is a better title or point to convey here?
I'm trying to make a point here, but it obviously went over your head.
http://cl.ly/image/0e2Q3m0o2P1I
It's not their job to provide detailed feedback to 100+ lesser candidates.
If you want feedback, it's best to apply through a recruiter. Then you can ask the recruiter why you were not selected.