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Stumbleupon is indeed missing in the modern algorithmic curation world.

I sorely miss del.icio.us

Someone built this which is similar but it grabs websites from blockchain pointers. https://orbz.fun

That someone is you or? You also made "orbiter"

I made Orbiter. I did not make orbz.fun. That was done independently and I didn’t learn about it until the customer shared it.