There is an update. He mentions that they restricted to minimum of 20 people, but there is a loophole, because you can select criteria on that group.
He gives example that if your want to target a guy friend, you can create a group of 1 male and 19 female friends and then create ad targeting just males to get around it.
He gives example that if your want to target a guy friend, you can create a group of 1 male and 19 female friends and then create ad targeting just males to get around it.