[sigotirandolas]

Traditional forums (such as phpBB) where posting "bumps" a thread are better in some regards. "Bumping" a thread at least requires you make more effort than clicking a button, posts inside a thread are unranked, and they encourage more in-depth discussion since threads can be long-lived.

RSS is great once you find interesting content but it doesn't help much in finding new content.

Otherwise... if you browse ranked boards such as HN/Reddit/etc., for topics such as politics (anything without a demonstrable answer, really), its also worth looking at both the stream of new comments, as well as the worst-rated comments. Most often the worst-rated comments are often just dumb spam or someone who makes no logical sense, but if someone tries to make a point and still gets massively downvoted for it (as opposed to just ignored), he may be striking on something.