Clientele Media mavens, industrial designers, Silicon Valley jet-setters.
Otherwise, the dining experience at Bibendum is pretty much as it was when Sir Terence Conran, Lord Paul Hamlyn and plain old Mr Simon Hopkinson first opened the restaurant in the former Michelin-tyre headquarters in 1987, attracting the sort of starry, media-friendly, monied clientele that today would be known as celebrities.
Some of Alt Berlin's fans have started an online campaign to gut the bar and move it a couple of hundred metres down the road, but few of its older clientele use social media.
When people say that a restaurant provides an evening of good theater, they are almost always referring to the high quotient of air kissing among a clientele with a high media profile.
"I've been disappointed that there doesn't seem to be a larger clientele, including in the media, for people who tell the truth," he said in an interview last week.
The offer for the artists taking part in the project is to be exposed to the A-list clientele, art collectors and media.
The service already has attracted well-known names like Bill Cosby and Linkin Park, but getting a robust celebrity clientele to adopt a social media service is often seen as a significant turning point at which a company breaks out of the early adopter phase and into the mainstream.
Nazis were rumored to have frequented the bar during the German occupation; today, the clientele consists mainly of goateed beatniks and media types.
He said the approximately 4,000 people who work in the mammoth building next door at 111 Eighth Avenue, many of them for media and graphics companies, represent almost a built-in clientele for the hotels, cafes and restaurants.
It's a situation rife for the kind of celebrity media madness that overtakes artists with a high-profile clientele.
Klein's love of and obsession with his celebrity clientele is still evident in his social media presence; the majority of his Twitter feed is devoted to links to his Quora profile.
