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I'm most intrigued by idea 5, but then, I have an affinity for incentive-based models. "Want your posts to be ad free for others? Click here" The downside of that is that it makes the site less attractive to potential advertisers, as one can imaging that the most popular posts, from the most popular users, are the ones most likely to be ad free. In that case, attracting quality ads to makeup any shortfall could be difficult. Generally, however, I think that idea is brilliant, as it presents a clear carrot-and-stick for each user.