I've told my parents, my aunt, (indirectly) the rest of my extended family on my mom's side, my 3 best friends, 4 or 5 other friends, 3 or 4 ex coworkers, and that's about it. But that's most of the people in my life. I don't mind telling most people. I've had more supportive reactions than unsupportive reactions. I actually don't think I've had any unsupportive reactions. Not to say that everyone I've told actually understands, but 4 of those people are also bipolar and they understand, and my parents, well...they try, and that's good enough for me.