I was looking through the keys in one of my key groups and noticed a key with a disproportionate amount of downloads, which probably meant it was shared with other people.
Suggestion:
It would be nice if the Download keys and Key group pages had a sorting option so you could choose to sort the keys by date or downloads (preferably being able to toggle between ascending/descending as well). This would make spotting keys with a weird high amount of downloads a lot easier, as opposed to having to manually scan every page of the group.