What can the social network Foursquare do for politicians?

It's the social network that is suddenly everywhere with 10 million users and counting. It's called Foursquare, and President Obama is the latest user to "check-in" and join the network.

If you're sitting at home wondering what it is and what it can do for you, you're not alone.

This morning on American Morning, CNN's Ali Velshi talks with Dennis Crowley, co-founder and CEO of Foursquare, to chat about what the program does, why it's getting so popular and why politicians are drawn to it.