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Yes, SU was fascinating at the time. I kind of like this style of exploring the web; it gets a bit addictive, you spend hours on it but end up finding interesting content and other stuff that you wouldn't otherwise.

Man, I wasted days on SU. It was incredibly addictive in a way that did not feel unhealthy.

Im surprised nobody has mentioned cloudhiker which is made to be like stumbleupon.

SU was amazing. Stumbling upon Ze Frank? It was internet gold!