A quick follow-up.
My last post regarding reddit ran just over a thousand words. I should be able to replicate that message with just one picture, but it turns out I need two.
This is my ‘disliked’ page on reddit. These are the links that I’ve downvoted most recently:

And this is my current “recommended” page:

My voting on Ron Paul links is very regular–I’ve been downvoting them like mad as an experiment for this post. I’ve been doing this for more than two weeks now, so even if there is a lag before the engine updates that couldn’t explain this performance. I hypothesized that maybe recommendations are only made on links I vote up. But similar testing seems to shoot that down as well: I love Ruby links and vote them up like crazy, but of the 46 stories submitted in the last two weeks with Ruby in their titles, I am recommended none of them.
In fact, of the links reddit has recommended, none seem to contain words I’ve voted up, but words I vote down with regularity are prominent. Not only that, I was actually recommended a link that I’d already voted down.
I’d like to file a bug report please…