I have a twitter account. I mostly use it to keep up with a few interests. I have only replied and retweeted.
I don't quit know what to do with it yet, but I plan to use it. I'm not sure if I'll use it on a professional capacity, personal, or a mix of both.
I feel I'm getting to the point I don't have to think much about what should be private/public, and more confident in what information can be tied to my identity.
Some of this is due to understanding people, and some of it is understanding how much most people aren't in the equation of my life.
For my career in modern day, I think I need to have a social presence online at least professionally.