That's protected from happening in my state of Washington, thankfully.
I've never heard of this happening to insiders in other states, though, because other places already pay minimum wage for kitchen staff. If one place decided to pull tipped wage trickery they'd have a massive exodus to a competitor. Delivery drivers on the other hand rely mostly on tips and management figures that they can take the abuse and tipped wage if they're making more than most inside staff anyway.
IIRC Google Talk using XMPP and most major messengers having GTalk integration, they pretty much accidentally federated several messenger apps