(This is kinda irrelevant and I don’t think it has anything to do with Facebook – but what a stupid policy. It won’t work. You cannot always say yes, if only because saying yes to one person may be mutually exclusive with saying yes to another person. All you can ever do is try to say yes to as many people as possible, never everyone.

Why are phones banned? Because one person can annoy the whole class with them. Banning phones in this case means creating an undisturbed Yoga class, i.e. saying yes to everyone who wants to be able to concentrate on Yoga and nothing else. I don’t think it’s unreasonable to think that’s the majority in a Yoga class.)