In 1999 there was Third Voice, possibly one of the best examples in history of an invention ahead of its time. Today it seems that Google is going in the same direction.
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Socialwrite 
It’s funny, back in 1999 as webmaster for a major bank at the time, 3rd voice was about the most horrifying thing we could contemplate. Webusers and customers allowed to talk to each other about you, graffiting up your homepage, unfiltered, unmoderated, the horror!
And then one day social media came along.