Hi. Here's a simple rule that you could do. If anyone want to post or promote their website, make it a minimum of 5 forum posts (or something). But here's the bad thing...people will sure to spam just to reach that quota.
Or, make that section as section that requires moderation (or approval before post), therefore only a handful of posts would be posted. Requires a bit of work tho, that mod have to find all of those 5 posts to see if they arent spams.
