But the photos aren't square when you upload them to Insta, right? I don't use Insta, so have no idea.

Most social networks are fairly consistent on "likes", but then you've got things like linkedin that have different "emotions".

This is one reason why I think GPS data is a good trial area for this. A fairly standard format, and most of the value add comes from the app you are using it with.

I'd not heard of DeSo before. Thanks for giving that reference.