I have been a member of Twitter for at least a year now...but it wasn't until recently that I became a Twitter-phile. I use twitter daily and post and receive updates from the people I follow. Part of my obsession has come from the application Twinkle, which lets me see what people are saying in my area, regardless of whether or not I am Following them on Twitter.
This article summarizes and captures what makes Twitter unique and why it is successful.
Oh, by the way, you can follow me on twitter here: @AxiomPR