I just found it on slideshare. Didn't see the talk but I still found it quite useful.

What actionable tips will you apply to your own product for example?

The scumbag viral mechanics slide made me think for a second. It seems quite effective to 'force' people to invite friends to get early access to a beta. More and more common. Klout I think does a really good job of offering something for each desired action from user, i.e. higher score & more reliable score.

I thought it was a great presentation with great advice. If you have specific questions, post it here and other HN'ers can add their commentary on it.