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People share everything on Facebook. That can be a very good thing or a very noisy thing. With Foursquare, people know that they're getting information specifically about a place, advice about where they are and what they could be doing. It's a very filtered view of the world.

It's very clear to users, more clear than in other apps, that Foursquare is an app for search and discovery, and we're very good at delivering you a social map that will show you friends' faces on the map and things that you might like.

It's a matter of invitations versus context. Twitter is really good at providing context, like, I'm having coffee at Third Rail Coffee.' Foursquare is about invitations to places. In this respect Foursquare has started to replace Yelp for me.

One of the biggest hurdles about Foursquare is you need to remember to use it.

Between the three, Facebook is literally everyone I've ever shaken hands with at a conference or kissed on the cheek at Easter. Twitter seems to be everyone I am entertained by or I wish to meet some day. Foursquare seems to be everyone I run into on a regular basis. All three of those social graphs are powerful in their own.

Facebook now is mostly about people you know. In the future it could be about people you know less but are more important.

The thing that we are trying to do at facebook, is just help people connect and communicate more efficiently.

I love Facebook. I could brush my teeth with Facebook.

The best version of Foursquare is the one you don't think about using.

MySpace is like a bar, Facebook is like the BBQ you have in your back yard with friends and family, play games, share pictures. Facebook is much better for sharing than MySpace. LinkedIn is the office, how you stay up to date, solve professional problems.