The article says that at the moment (realizing that this is still very early), users are limited to one message a week. I imagine that this will rise, but if th

The article says that at the moment (realizing that this is still very early), users are limited to one message a week. I imagine that this will rise, but if they keep a relatively low limit on the amount you can send, I should think that spamming would be infeasible. It's also (again, currently) "not available to Brands."