If reddit and Twitter kill their API, there's probably space for a noutofband plugin that creates arbitrary forums on content. Like, you find a website with an image, you hash the image and that creates your standard forum and voting system. Then wheverver that hash shows up, so does the forum.
Something like https://annotations.lindylearn.io/ - a collaborative social layer for annotating all webpages. Ran across it when browsing Marginalia.nu a while ago. I also miss StumbleUpon.
