It can be useful. If I'm in public and can't find my wife and she can't find me we call out Llama. The correct response is Duck. It's our own Marco polo.
Oh God I miss the days of when we could just be silly on the net for the sake of being silly. Can't do that no more. Make a DNC joke and you're a racist and homophobe. Make a Trump joke and you're a Leftist and Communist.