I think it’s fair for a poster to not name his source when he feels it might compromise his anonymity. It’s equally fair for any CR reader to take anything posted (even if the source is named) with a huge mound of salt, unless independently verified. I include anything which I post (although I do try to be accurate).
BTW, I heard from a reliable source (my browser’s spell check) that the word is spelled r e l i a b l e. 🙂