More than half of Americans have smartphones.
Adam Rifkin stashed this in Mobile!
More than 50% of people in the U.S. now have smartphones. Therefore, if you ever get in a disagreement about something historical or factual with a friend you can just look it up on your phone. Odds are one of you are going to have one. As for emotional/opinionated disagreements, your smartphone can't help you out with those — yet.
Guessing is now obsolete.