There are sources not on that list which will are not allowed. I asked the same question a while back and never did get a definitive answer.
My advice: If you post something not on that list and it is removed because of the source, add that source to YOUR list and don’t post it in the future.
“post something not on that list and it is removed because of the source,”
Happens to me once in awhile. there are a lot of wild and wooly sites out there.
No sure how up to date the list is but it offers a starting point. Like you said if
they pull something you post then don’t post from it again would be my thought.
Updates but not current it seems.
http://www.freerepublic.com/perl/FORUM/THREAD/thread-history?thread_id=1111944