Mentioned this as a reply, but perhaps worth posting again: check out https://are.na https://are.na if you are one of the folks yearning for a similar thing (th

Mentioned this as a reply, but perhaps worth posting again: check out https://are.na https://are.na if you are one of the folks yearning for a similar thing (that isn't pinterest). Arena is certainly a tool for a certain niche, but it has a great API (some people have used it as a CMS using the API) and you can create "channels" of content (images, text, URLs) that can be nested/associated within other "channels".