Has anyone here successfully bolted on a forum onto a site? I'm going through the age old subfolder vs subdomain question. Normally, I'd would almost always stick with a subfolder due to SEO benefits. However, I'm afraid that a mass of User Generate Content (UGC) would dilute the main site and perhaps have Google bot question its authority and content quality. as Google is not real fond of forums and I could see less than stellar content being added by users. The site will likely hit close to 1 million page views this month and 3-5 million in mid summer, so I don't want to risk that traffic. I'm leaning towards using a subdomain. Thoughts?