Hello sir. I have experience in developing an AI program to beat GameHouse's TextTwist. My program work mimic human behaviour when playing the game. I think my experience is enough to fulfill your need. For this project, I'll use Java and Apache's commons-httpclient (opensource library). But I still need further description about your requirement (what will you post to the site, what's your strategy so that the site admin don't know that the post is actually sent by a bot, etc)