“I don’t really get Twitter,” I told Andy at lunch last week.

“What do you mean?” he asked.

“Well, I try to be interesting and post useful links, but I’m finding it hard to balance between tweeting for my friends and tweeting for my readers. I only have one account, so my private and public persona are enmeshed.”

Andy shook his head. “You’re overthinking it, J.D.,” he said. “Just write what you want to write.”

At least he understood what I was talking about. Until recently, few of my friends even knew what Twitter was. Now, though, it seems to be reaching some sort of critical mass. Yesterday, for example, actor Kevin Spacey appeared on The David Letterman Show, during which he schooled Dave about Twitter:

Funny stuff. And, like I say, Twitter seems to be gaining widespread acceptance. Heck, even my mother is on Twitter now!