@edk @otherthings My sense is that Pinterest's culture and Tumblr to an extent was where I saw the most resharing out of context (not that Insta or Twitter didn't contribute). But definitely both of the former were kind of collage-y, mood board-y and fandom heavy in ways that promoted "these are part of my identity".

I think attribution was always more popular where doing so was seen as building a social network (and trying to promote friends and admired sources).

Age plays a role too...