To Twitter or Not to Twitter

I'm new to this Twitter craze and am not sure of the rules. I noticed that someone I know, but not well from work is on Twitter. I decided I would follow them and added them to my list. Moments later I panicked and removed them. It occurred to me that they might not like me to follow them and would find it uncomfortable, and also find it difficult to ask me not to.
Its kind of wiered a bit like being back at school, trying to hang with the right crowd but not being sure if you fit. Anyway if you want to follow my Twitter along with the whole eleven other random folk go ahead, my Twitter is on the right hand side of the blog.
Cheers and here's to hangin with the nerds.