Add a search
For the Unfavinator, what you have now replicates clicking the yellow star on the Twitter Favorites page (except I can't follow a link to make sure I do want to get rid of this one...). What would make this very much worth while would be a way to search, for a user or a hashtag or just words in the tweet, and see a filtered list of favorites. Then delete them, either one-by-one as now or selecting batches - or even better, Select All and then unselect the few I want to keep.
The twitter API does not currently allow searches, but we have added a username filter and it is now available and we will look at other options like phrase or hashtag.