Your friend has invited you to visit the CommonCensus.org website.
The CommonCensus Map Project is redrawing the map of the United States based on Internet users' input, to reveal the boundaries people themselves feel, as opposed to the state and county boundaries drawn by politicians. It shows how the country is divided into 'spheres of influence' between different cities at the national, regional, and local levels.
This information will finally settle the question over where disputed cultural boundaries lie, contribute to the national debate over Congressional redistricting, and educate people everywhere as to the true layout of the American people that they've never seen on any map before.
Participation takes just 12 clicks. Take a look and participate at: http://www.commoncensus.org
PLUS, if you're a sports fan, you can vote on which sports teams you support, to make a similar map that shows exactly what areas of the US support which teams.