you could also detect when someone on your contact list "joins" a kind20 app by noticing if they post a kind 20. then the app could suggest: "hey, looks like one of your contacts is posting photos, you want to follow them on your kind20 follow list?"
Discussion
Yeah, that's what nostr:nprofile1qqs8y6s7ycwvv36xwn5zsh3e2xemkyumaxnh85dv7jwus6xmscdpcygprpmhxue69uhkv6tvw3jhytnwdaehgu3wwa5kuef0ekucf3 is trying to do on Zapstore. So, you will know which apps to install based on what your friends are using.
