Weak evidence so far, but then I'm active only for half a year:
I got specific advice for community building (LW and Giordano Bruno foundation) from someone I met on the Berlin community event,
I was coach surfing host for two inter-meetup guests who approached me via email purely based on my LW posts. This led to very interesting discussions but not more yet.
I'd like to ask everyone: Have LessWrong.com and related online rationalist/transhumanist/Singularitarian communities connected you to people for purposes beyond discussion?
Bonus points if an online contact led to an important connection. We already know that face-to-face meetups are a great way to meet people, so I'm curious about connections triggered by online interaction.
I have seen scattered mentions that each of the above has happened, but not enough to get a strong impression of what's going on.
Please answer in comments below. By doing so, you'll be providing social proof that LW and the like can accomplish these things, and so encourage more to happen, increasing happiness in the world.
I added one myself to start.