I think for someone to really get into Twitter, they need to have a base network to begin with. Friends, coworkers, anyone to follow immediately. When I first joined twitter some 3 years ago, I didn't have anyone to follow, and it quickly lost it's purpose to me. Once I got into Icrontic and found out a few of the guys used it, I joined and followed them. Through my interactions with them, I found other interesting people to follow, then once I started to see how enjoyable it was, started to seek out people that shared my interests.

Now it's a powerful part of my daily routine. It's honestly one of the biggest reasons why I got a smartphone.