I like Sivers' version because it was more thorough. But it's good to hear the same idea expressed by a new person in a new way. You need new iterations and personalities you trust to make things click. That's essential to them spreading.
And where Seth observed, "We need more guy #3s," Sivers called you to action: "When you find a lone nut doing something great, have the guts to be the first person to stand up and join in.": http://sivers.org/ff
Yes, indeed, it is ours - I first heard it back in June 2009, on Seth Godin's blog. It got posted up on Hacker News too.
Here's the seth post of the same video, making the same post (though he reckons guy #3 is more important than the first follower):
http://sethgodin.typepad.com/seths_blog/2009/06/guy-3.html