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Have you tried posting to a blog site or a wordpress site your comments automatically. I mean you have this list of urls of the blogs site or wordpress sites, like an auto submitter for comments, guestbooks, link dumps, and bbs(message boards)
It's entirely possible using the cURL library (lots of info in the PHP manual), but be aware that bloggers don't like people running such scripts and actively work to stop them (by introducing captcha security things for example).