Hi, I’m an iPhone 4 user, using Facebook app. Within iPhone app on iPhone, i stupidly clicked on "Sync Contact" with Facebook. Can everyone see this info e.g. Mobile numbers etc on Facebook or is it only me that can see this info when i log into my Account?

thanks in advance

You can choose what information of yours is made public. You can usually choose either friends only, friends of friends, or everyone. It's much easier to manage privacy settings from the main Facebook site.

Any contact information synced to your iPhone contacts is held directly in the main iPhone contacts database.