Alternatively, let people choose to make their votes public, then provide a way for people to provide an algorithm based on that data to filter/mark posts.
Note that I think the relevant preference controls whether that page is public, so you can’t check whether you enabled it just by looking at your own; you need to look in a logged-out browser.
Alternatively, let people choose to make their votes public, then provide a way for people to provide an algorithm based on that data to filter/mark posts.
Already supported; for example: http://lesswrong.com/user/gwern/liked/ and http://lesswrong.com/user/gwern/disliked/ (there’s even RSS feeds for those pages! like http://lesswrong.com/user/gwern/liked/.rss Nothing stops one from grabbing RSS feeds and doing any processing they please on them.) That, over the past 5 or so years LW has had this feature, no one has noticed or made use of it...
Note that I think the relevant preference controls whether that page is public, so you can’t check whether you enabled it just by looking at your own; you need to look in a logged-out browser.