I've been using facebook, nothing SEO or targeted traffic related.. All I've been doing is getting a facebook account to 25 friends, and then redeeming a prize. But after the first 5-6 accounts I've been starting to get blocked by phone verification, and I don't know what it is they know it's me. I've been changing ip's, even computers, yet it still blocks me with a phone verify. Any checks that I should know of? What do?