Prove to me you're human...

I put a couple of things on Freecycle, and as is my custom ended the item descriptions with:

Free to a good home. Please make it clear that you are human and genuinely interested in this item when you reply - if all I get is a message saying something like "I want this" or "plz call my cellphone" I'm not going to bother replying.

So far I've had two "I want this" messages, once cellphone number, and one person who posted "Hi. I am interested. Thanks." six times to the same item. I might actually reply to him, since this does seem to be an attempt to comply after a fashion.

Count me less than impressed.