A small question (and please forgive me if it was dealt with before, I skimmed all 75 pages and didn't notice something clear on the subject):

Does Whatsup share my contact list with Facebook (Whatsapp)?
Can I control it?

By contact list I mean the numbers stored on my phone, obviously anyone who is a whatsapp contact is known to them but all the other numbers and their details I have stored....

Thanks!