While we're looking through previous 'could have been facebook' social networks, I remember receiving invites to sixdegrees.com
<a href="http://en.wikipedia.org/wiki/SixDegrees.com" rel="nofollow">http://en.wikipedia.org/wiki/SixDegrees.com</a><p>This old article from 1998 is worth a look:
<a href="http://www.dougbedell.com/sixdegrees1.html" rel="nofollow">http://www.dougbedell.com/sixdegrees1.html</a><p>Social recommendation:
"You can get a movie review from Siskel and Ebert, but wouldn' t you rather hear it from friends you trust?" he asked."<p>Value in data:
"In exchange for traffic at its site, Six Degrees sells advertising on the site and its demographic information compiled from member questionnaires."<p>The wall:
"Logging in brings users their own personal bulletin board, where only their first-degree circle may post messages. A powerful internal search engine lets users locate those with similar interests, contact Six Degrees members worldwide and spin out from their sphere of influence. "<p>You can speculate about why it didn't get further.
I would speculate the network of people online regularly just wasn't dense enough for adoption, it didn't have the viral hook of signing up to view photoss, and the dense clusters (universities) to grow the network out from.<p>Still, they were thinking far ahead of the game.