To Tell or Not to Tell?

Another question for veterans of weight-loss surgery, and those who are considering it:
 
Would you/Did you tell people in your life about your surgery?  Beforehand, afterwards, both or neither?

Part of me is pretty sure it's really nobody's damn business.  The other part of me says "yeah, but if not for hearing success stories and encouragement from people who'd had the surgery, I wouldn't be on this path, so why not share it?  Maybe I can pay it forward..."  
There are people in my family that I won't be telling beforehand; mostly because they will get so wound up and anxious themselves that it will set up a cycle of angst.  Their anxiety will lead them to question my choices, which will make me defensive, which will make them more upset, yadda yadda.  Better to keep it to myself until it's a done deal.  At least, that's how I feel about it at the moment; maybe I'll change my mind and want to tell everyone, I really don't know yet.

What was/is your policy about telling people about your WLS?