I've always wondered if pagination has any effect on the overall SEO. In the past, I've experimented with having 10 or 20 posts per page (more content on any page) and had different results. I found out that having 20 posts per page would drive more traffic over the period of time; because Google would find lot of unique content on any page. But I'd not draw any conclusion because there are several other factors that determine the overall rank of any page. So the question is: What's more preferred by the search engines? A lengthy thread with over 2000 words on one page OR The same content divided over 5 pages? Which one do you think would get more love from Google?