Back in December '22 when the first big influx of users joined nostr nostr:nprofile1qqsgydql3q4ka27d9wnlrmus4tvkrnc8ftc4h8h5fgyln54gl0a7dgspp4mhxue69uhkummn9ekx7mqpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqg4waehxw309aex2mrp0yhx6mmnw3ezuur4vgkhjsen was replying to every new person with 🤙. That's how it became popular around here. It's also the default "like" emoji on Damus.