do you know other forum u know?
I read in a thread somewhere around here that
https://letstalkbitcoin.com had some form of pay to post system; however, I have no idea how that worked in practice, or if it is still active. I suspect a few other (mostly small) forums will also occasionally have rewards for posting, probably as a way to bring in new content.
Like mining, the rewards decrease over time. I was there at the start, but found myself hearing less and less and ultimately stopped as the coin number reduced. Those LTBcoins are still lying in my wallet.