I've remarked before that #NOSTR is the perfect protocol to base a new photo sharing platform on.

What if NaturePics is nothing more but a paid relay that only accepts and relays notes from it's own client (maybe by adding a field in the note that is basically a f=(AxB) where A=the NPUB and B a hardcoded password in the clientapp and f=the code that makes your note be allowed on the relay. B can be updated every now and then to prevent spam attacks on this relay.

In this gated NOSTR community you own your social graph (because well hidden is settings is your NSEC) but you only see nature pictures.

NaturePictues is just one example off course, but I know that the sharing-pics-between-platforms is a real hassle. What if some friends are on Android and some on Apple (and don't have a gmail account) ? Then Google Photodrive is not an option, and neither is a shared Apple-Photo-Album.

Making a cross-platform-photo sharing app is one of the many ways NOSTR can be utilised 😃 nostr:note1e3lk3zcmh5vftqxc3jqe0ng9h7h3lw002yaak0ut3adhdnuct2eqr5qxrt