Thetigerxxx: I guess it is a human nature, lol and I think the only way to stop them is by confronting them about it. Otherwise if they are never confronted, they will never stop.
I personally find nothing wrong in pointing out that something is being "stolen", z.b.this poem posted without naming an author, and don't have intention to hurt topic makers feeling lol, just its not nice to take something whats not yours lol.
I know I will rather remain stupid/average than to steal someones words in order to prove someone how smart I am.