The story goes that when the Great Library of Alexandria burned down in 48 B.C., it had a copy of every book in the “known world.” Its destruction represented the annihilation of so much of the world’s knowledge that humanity lost things that are now gone forever. What’s remarkable is that each of us holds, in our pocket or bag, a device that connects us to infinitely more information than could have ever been held in a million Great Libraries.

I have conflicting feelings about Foursquare. On the one hand, it’s a kind of boring concept ‘“ a phone app that lets people know where you are via check-ins? Sounds a lot like Twitter but with less words (and who knew that was even possible?) But in spite of this,