I've noticed that usually when people get a new phone number, or have lost their phone they start up a facebook group/page/event asking their friends for their phone numbers. Most of these people don't bother setting up the privacy settings on them, so anyone can view them and see the numbers. 1. Search on facebook for "lost numbers", "need numbers", "new phone" etc. 2. On the search filters on the left hand side click on events/pages/groups 3. Go down the list 1 by 1 and look at the walls, the phone numbers are ripe for the taking. What you do with these numbers is up to you, obviously they haven't opted in so you probably wont be able to get away with SMSing them from a shortcode.