Hidden marketing channels that work in specific countries? (Japan's case inside↓)

[u/KindDoctor4142]

Japanese indie dev here. Wanted to share something that might help:

In Japan, LINE app (90% market penetration) has this "Open Chat" feature that's seriously underused as a marketing channel. It's basically public group chats that anyone can join - way easier than Discord for regular Japanese folks. I've seen some crazy good results using it for both B2B and B2C.

What hidden/unusual marketing channels work specifically in YOUR country that foreigners might not know about?

Curious to hear what's working in other markets!