[hackerbob]

Perhaps I poorly worded by saying "ten minutes in", I meant starting from 10 minute and 10 second mark Sergey brings up how he's been using the service internally.

Edit:But going back to your point, I not sure Pagerank is relevant to twitter/facebook, and I don't think Sergey was saying that it was. But I do think their could be search problem emerging in social networks when people start having several hundred friends and you want to find relevant conversations to your interests going on within your network.