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Google Wave was a pretty good idea. Apache Wave stuck around for a bit though I don't know if anyone used it.

A lot of the things in Google Wave filtered out. Real time document collaboration is fantastic, and I don't think it existed as much in the public consciousness before Wave.

Google+ had some good ideas. The multiple social circles thing is still the easiest way I've seen that done. I don't know if facebook has fully copied it yet or not.



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