Many. Here’s one:

The Grapevine calculates an influence score that is context based — eg, Alice’s Grapevine tells her that Bob is awesome at rating movies in the comedies genre, so he gets a high score in that context, which means if she’s looking for a comedy to watch tonight, his ratings of comedies are weighted heavily. Problem: how to calculate the Influence score in a way that doesn’t give undue influence to Bob just because he has a zillion followers? The Grapevine’s solution:

https://habla.news/a/naddr1qqxnzdes8q6rwv3hxs6rjvpeqgs98k45ww24g26dl8yatvefx3qrkaglp2yzu6dm3hv2vcxl822lqtgrqsqqqa28kn8wur