I'm not the kind of guy who dabbles in a lot of things.

If you take a look at the way the premium content is monetized, there's a lot of different models out there. Sometimes you pay for an individual episode, for example on iTunes. Other times you pay for a subscription. And other times it's free ad-supported.

Cultures are not very easy to change. They're sometimes almost impossible to change.

I think challenge for Facebook is to develop a culture that has the advertiser and the ad service be as strong a part of their culture as the user obsession is.

Look at the world around you & imagine it in a better way.

On the Facebook side, I think it's a bit of an evolution, in that that company, which has clearly done amazing things, was, I believe, as an outsider looking in, was founded on a culture that was obsessive about the users. And they built a service that is very valuable for users, and that is to be applauded.

My prediction is that in the same way that Google is an intent revealing service that can be monetized that way, I would think that if I were at Twitter, I would focus on the search aspect of Twitter, because people are revealing intents when they do a search.