These includes Tiffany Trump, Donald Trump’s 22-year-old daughter with Marla Maples. With Ms. Kennedy, Ms. Benitez and Ms. Matisse, she modeled for Just Drew’s first New York Fashion Week show at Gotham Hall in February.  Among his older supporters is Jason Binn, 48, the magazine impresario who was a founder of Gotham, Hamptons and Ocean Drive, the latter started in part with money invested by Michael and Marcy Warren. Last summer, DuJour, another of Mr. Binn’s magazines, featured Mr. Warren and his set in a sprawling article called, “The (Real) Rich Kids of Instagram,” a reference to a website that mockingly aggregates lavish photos posted by the young jet set.  “Andrew’s a heavyweight, and it’s a very crowded field,” Mr. Binn said at the Dolce & Gabbana party.  “Everything!” Mr. Binn said. “He hustled and hustled, and he became friends with everyone and then best friends with everyone. He built a great Rolodex, and the next thing you know, he’s got them to work for him!”  Mr. Warren’s Rolodex is burnished, of course, by his agile Snapchat, which Mr. Binn called “more colorful than a Puff Daddy video.”  These seconds-long snippets take viewers to loud, throbbing nightclubs, show the gang smoking on balconies and posing near private jets. A recent scene focused on Lita, the Warren family’s live-in nanny and housekeeper, as she tried to step over doorway gates in place to limit the wandering of the family’s dogs as she carried a stack of empty pizza boxes.  “We’re at the Hampton Classic, get over that one!” Mr. Warren can be heard saying as he trained his camera on her.  Despite such displays, the “Rich Kids of Instagram” moniker rankles Mr. Warren and his clique. “I party and I have fun, but I’m doing something serious,” he said. “Like Rihanna, because she sings, and rappers — no one is judging them for going out. But when I go out it’s like a judge.”  Even as they grasp that their postings can draw scorn, the Snap Pack seems unable to relinquish the habit of social media, and the illusion of image control it affords. “I look good in pictures I take of myself,” Ms. Matisse said as the group settled in for dinner at Vandal.  Ms. Matisse, who said she is a method actor — “it’s my passion” — graduated in 2015 from New York University, where she studied “the self and other identities,” she said, “the Eastern psychology of ourselves and Buddhism and how the East is so much different from the West and it’s all very interconnected.”  She admitted some ambivalence about her activities on Instagram. “It’s so consuming, it takes so much time,” she said. “I hate the process of the Instagram, the contrast, the saturation, the filter,” she said of editing the pictures. “Then I send it out into the world and may not even ever see it again.”  Friends joined the table, seating arrangements were shuffled, and a bottle of eye drops was passed around, enhancing more sultry selfies. Barron Hilton, 26, brother of Paris, was among the stragglers from the Dolce & Gabbana party. He was wearing a bathrobe and chatting excitedly about his Instagram food blog, Barron’s Bites. The waitress carded the diners as they ordered cocktails. Mr. Warren got an extra glass, and several of the friends poured in their drinks: straight vodka, margaritas, something and tonic.  Ms. Kennedy sipped the concoction with a straw and smiled sweetly as a photographer captured the moment. “Sorry, Dad!” she said with a laugh.  A week later, the Snap Packers gathered early on a Tuesday morning in the green room of “Good Day New York,” the local Fox morning news and talk show, for a segment focusing on Just Drew. Mr. Warren’s mother is a friend of one of the hosts, Rosanna Scotto. Mr. Warren would be interviewed as Ms. Kennedy, Ms. Matisse and Ms. Benitez modeled.  Also serving as a model was Alexa Greenfield, 23, another friend of Mr. Warren’s and an entrepreneur whose ventures include jewelry for men’s ties. “I’m friends with Andrew, but I’m tamer,” Ms. Greenfield said. “I’m hidden, I don’t let him put me on Instagram.”  She chatted with Blake Frank, a Just Drew employee, and Chris Bolos, who does production, sourcing and other tasks for the family.  Ms. Matisse was not there yet. She had slept at the Warrens’ apartment and was apparently concerned about leaving her teacup longhaired Chihuahua there. “Marcy has three dogs,” Mr. Bolos said, “and Gaia has a little rat.”  Perhaps she could just bring the dog to the Fox studio, someone suggested.  “We’ve had segments on wild animals before,” a Fox publicist said.  “They’re animals all right,” Mr. Bolos said dryly, referring to the Snap Packers.  Late to arrive were Mr. Warren, Ms. Kennedy, Ms. Matisse and Bambi, her dog, which was dressed in a monogrammed cashmere sweater. Social media happens on their schedule; old media less so. Mr. Warren had to drag his friends out of bed. “I feel like I’m a parent getting a kid up for school,” he said.  Though the stakes were low — the Just Drew line is, for now, mostly available on the company’s website — Mr. Warren was nervous, sitting on a chair in skinny black jeans with frayed leather patches and a fitted T-shirt (having lost 88 pounds a few years ago, he takes pride in his physique).  Mr. Warren remarked on Ms. Trump’s absence. “With Tiffany Trump, there is too much going on,” he said. “It was great press, but it was a distraction from the designs. I don’t want to mix with politics.”  He has done charity work, however, including starting the first junior committee for Denise Rich’s cancer foundation when he was in eighth grade. “I got Natasha Bedingfield and the cast of ‘Gossip Girl’ at the first event,” he said.  Dressed in Just Drew pants and a crop top, Ms. Benitez sat with her phone looking at photos of herself in Miami, then sat on the arm of Mr. Warren’s chair and began snapping the two of them. He nudged her away. “He doesn’t love me anymore,” she said, fake pouting.  “I like to take photos,” he said, “but I’m not a bad person. I’ve had a cancer patient D.M. me on Instagram and say, ‘Your Instagram snaps give me hope.’ She said I inspire her and I make her want to keep going every day so she can have a fun life.”  But then it was time for him to do a quick primp. Mr. Warren wears his hair in a comb-forward, and it requires certain maintenance.  “Fix the swoop,” Ms. Benitez advised him.  “I want to do it right before we go on because it falls immediately,” he said.  The time arrived, the swoop was swooped, and the group got ready to head to the set. But first, they posed for a group selfie.
New York is home to a young, wealthy group for whom taking photos for Instagram and Snapchat is not a way to memorialize a night out. It’s the main event.