Ah cool, this is more interesting than just showing the people that got the most likes or zaps or whatever, as that list probably doesn’t change as often.
For this list it's the profiles that were followed by the most 'popular' people in the last 24 hours (there is +N number near followers count on nostr.band). 'Popular' is based on our trust rank https://trust.nostr.band
I will experiment with some other approaches, but this one is simple and to me it works well, I see new interesting people there every day.
Discussion
Yeah, I think likes/zaps are more about a particular post, but a follow is definitely about an author - a new follower found the author's content valuable enough for a follow. It seems just more meaningful to base the list of trending people on new follows.