The entire chain: the facebook likes are fake, the hipsters, the customers, even the press release? Do those restaurants even exist in reality ;) ?
Unfortunately.
But the Salmon probably isn't real.
I tried to think of a realistic scenario where someone would be inclined to fake the existence of a restaurant: to make real estate look more appealing? If a RE developer built a development with several dozen houses, it could boost the values of houses enough to make it worth the cost of faking a few trendy bars/creameries/restaurants next door.