System/secrets
From Lantern Hill
Every character has two secrets that other characters know about. There’s a lot you can do with secrets.
An important fact to remember is that players have no idea which characters know their characters’ secrets. You just have to hope that the people who know your secrets won’t abuse that knowledge.
Good luck with that.
Ranks
Every secret begins at rank 1. Each log someone uses that secret for persuasion, shares it or even talks about it, the secret gains one rank.
If nobody talks about a secret during RP, it stays at its current rank.