Yes, I mention that in the other comment. Nothing short or too repetitive or similar. "GM" "Good morning" "Hi" "Yo" is all the same thing.
You would also want to filter out anything too reply-guy-ish. Sometimes discussions break out in GM threads, but sometimes it's just a string of GMs, so you'd filter out the second type.
Here is another example. This note shot up into the trends, but it has a flat structure and the original poster has never replied or written anything else. No human interaction, despite so many replies. We all just look silly.
nostr:nevent1qqstd2mffmavec70lf3q66ycm550c9tyh364quzev9c3pakdfr7kcegpzamhxue69uhkummnw3ezu6r4vfkkz6m9wghxjmczyrw587khexkvw6wl3ku80860crt0fktldg9z0rk05gvrukjc9u5y7qcyqqqqqqgwdv7xx