[cyanydeez]

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.

[creamyhorror]

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.

[musingsole]

I'm always yearning for a modern StumbleUpon

[mrguyorama]

The problem with a StumbleUpon now that the internet is an everyone thing is that the second it becomes popular, it will contain nothing but spam.