The Twitter Phenomenon

I have just started using Twitter, and am still getting used to the concept of what it offers. Browsing through people I am a fan of, I began to wonder about how bands use Twitter to communicate with their fans, and keep them informed about their actions and thoughts on certain issues.

This form of networking site allows the fans of artists and other famous celebrities to know what they are doing, and just rant about something they feel like sharing to people who are following them. But does this pose a risk for ubber-fans to take advantage of this information? By sharing intimate information, or details about exactly where they are, it allows any to be able to track them down.
Anyone have any thoughts?