I have to pile onto Findory with Paul Lamere. Sometimes Findory seems to get fixated on certain things and keep recommending them. For me it's not topics so much as sources. I don't want to name names, but I can easily rattle off 5 feeds that Findory keeps recommending items from, mabye even all the items, leading to a defacto subscription. I've clicked through to these sources once if at all, months ago, and can tell from the item summaries I'm not going to take further suggestions any time soon.
It's not that big a problem, since I don't have to do any work to ignore these items. I get my Findory suggestions as a custom RSS feed. On the other hand there's got to be a tiny incremental cost to suggesting unwanted things that adds up over time. Wonder if anyone in the recommender community has examined the cost of poor recommendations other than a minimal, "people didn't use our system until our recommendations didn't suck," effect.
On the third hand, I imagine it has to be tricky to take user input for this problem and yet prevent users from blowing their foot off.