I just signed up for Google alerts on a couple of topics, one being Twitter. It was very easy to set up the alert service. I get an email each day on each topic with links to articles on the web about the topic. I'm really liking Google alerts. It's turning out to be a great way to keep current on topics I'm interested in. Most of the links are very relevant.
Today's alert about Twitter included an interesting review of the service done by abc News. Twitter: Social Netoworking? or Cyber Stalking? Check it out.