It's even worse when you consider that others will put something about you out there. They willingly give up their contacts list (with you in it), when joining

It's even worse when you consider that others will put something about you out there. They willingly give up their contacts list (with you in it), when joining a network. A "friend" may make a photo of you as part of a social/work event and directly post it publicly. Even with no participation on your behalf, your real name, phone number, address and photo are out there.