How can a scientific phenomenon be "proved" in a message board post? The damand for proof of evolution in messageboard text is absurd and should be given the respect and response it deserves: none. A messageboard post can provide only documentation of evidence. That's it.
Evolution is not something that needs proof. It is observed. I have not seen it myself but I personally know scientists who have seen it firsthand in their labs. They make a living based on the results of their observations. If evolution didn't happen, they'd have long since lost their jobs by now.