My mom asked me about Twitter the other day. That's how you know some technology or service is going mainstream.<p>Unless your parents are really technically savvy or something.
Twitter is absolutely mainstream now. It's quite weird - in the last several weeks almost all my friends and family have signed up. I'm not sure what the tipping point was, but celebrities appear to have a lot to do with it.<p>5 million users now -- I expect this to balloon exponentially very shortly.