The one thing you can say for certain about Twitter is that it makes a terrible first impression. You hear about this new service that lets you send 140-character updates to your “followers”, and you think, Why does the world need this, exactly？ It’s not as if we were all sitting around four years ago scratching our heads and saying, “If only there were a technology that would allow me to send a message to my 50 friends, alerting them in real time about my choice of breakfast cereal.”

　　And yet as millions of devotees have discovered, Twitter turns out to have unsuspected depth. In part this is because hearing about what your friends had for breakfast is actually more interesting than it sounds. The technology writer Clive Thompson calls this “ambient awareness”: by following these quick, abbreviated status reports from members of your extended social network, you get a strangely satisfying glimpse of their daily routines. We don’t think it at all moronic to start a phone call with a friend by asking how her day is going. Twitter gives you the same information without your even having to ask.

　　The social warmth of all those stray details shouldn’t be taken lightly. But I think there is something even more profound in what has happened to Twitter over the past two years, something that says more about the culture that has embraced and expanded Twitter at such extraordinary speed. Yes, the breakfast-status updates turned out to be more interesting than we thought. But the key development with Twitter is how we’ve jury-rigged the system to do things that its creators never dreamed of.

　　In short, the most fascinating thing about Twitter is not what it’s doing to us. It’s what we’re doing to it.