Wow! Everyone's iPhones are recording their location constantly. I'm more excited than scared. Unpack your info here:

First are the social connections, called your Elastic Network. All of your contacts are presented in a list of thumbnails ordered by how strong your connection is to that user. Whenever Color detects that you’re physically near another user (in other words, that you’re hanging out), your bond on the app gets a little stronger. So when you fire up the app and jump to your list of contacts, you’ll probably see your close friends and family members listed first. But if you don’t see a friend for a long time, they’ll gradually flow down the list, and eventually their photos will fade from color to black-and-white.

4sq just released this roundup of 2010 in infographic form