In a recent edition of his Online Newsletter, Dick Eastman gives us a personal take on dealing with unsourced information found on the Internet. I delighted in reading his view because it parallels my own, and if you have been to any of my classes, you have probably been treated to my expressing it.
One comment made by Dick that I want to highlight is "The proof is always up to me, regardless of where I found the claimed information."
You can find Dick's article at http://tinyurl.com/2byad88. It is an excelled read.