MetaFilter should definitely nofollow their external links in the comments. That makes sure that spammy/unnatural links do not count as a vote (which turns MetaFilter into a bad neighborhood as far as search engines are concerned, and attracts the spammers).<p>... <a href="#">Sample</a>, an Indian online pharmacy. I have not ordered from them myself. ...<p>They should look real hard at their site structure and which pages they allow to be indexed. Too many vague subdomains, and 'posts tagged with...' in the index.<p>I wonder what their user metrics show to Google. I don't think Google is penalizing sites based on a mere hunch, or won't notice that a site like MetaFilter got hit by an algorithmic update.<p>This site is someone's child, so it's hard to be too critical, but the view that MetaFilter hosts the quality content of the internet is far too rosy.<p>Pages full like: <a href="http://www.metafilter.com/67307/Gampoumlmbampoumlc" rel="nofollow">http://www.metafilter.com/67307/Gampoumlmbampoumlc</a> Which are veiled spam pages. Pages full of inane babble about medical issues or personal drama, with the credibility and authority of a Yahoo Answers page. Just because people paid MetaFilter to post, and a site is heavily moderated, does not mean it adds anything to the search results for most generic search terms.<p>Then most links or interesting stories are from elsewhere on the web. MetaFilter is kinda like trying to rank with the old Digg comments: not the best place on the internet to read a discussion surrounding a topic. Why deserve to rank for linking to a funny or controversial news article, and riling up 15 comments or so?<p>In the end there may be far more natural reasons for this. The user signals showed something was wrong with the site. People bounced a lot (be it the design, be it because you can't comment without paying, be it because 15 random internet comments have little value). In the meantime Reddit and other sites grew to large communities. You don't see Reddit comment threads ranking all too high either, unless they are really special, popular or significant, like the president doing an AMA.