The photographer Marcus Hyde was a rising star: a favorite of Kim Kardashian West , responsible for a Fendi social media campaign, with a million Instagram followers . But this week, multiple women said he had used his growing profile on social media to engage in inappropriate behavior, including soliciting nude photographs from models in exchange for shooting them.

Mr. Hyde’s rise and fall have played out almost entirely on Instagram, revealing just how much the platform, beloved of the fashion and visual art worlds, has enabled bad behavior within those industries. Amid all the conversations around privacy and the dangers of data use, less attention has been paid to the ways social media can be used by predators.

Word of Mr. Hyde’s behavior began to spread Sunday when Sunnaya Nash, a model who has worked with Calvin Klein and Converse, posted screenshots that showed the photographer asking her to send him nude pictures of herself before an official photo shoot. She said in an interview that she had messaged the photographer in response to a call on his Instagram for new models to shoot. When she declined his request for nude photographs, he said he would charge her $2,000 for a shoot that would have otherwise been free.

After Ms. Nash posted the screenshots in an Instagram Story, she began receiving messages from other women who had been approached by Mr. Hyde asking them for nude pictures. She posted these as well. Diet Prada, the fashion-industry watchdog, reposted the Story. Ms. Nash said that at least 50 women had contacted her, and that their stories were “similar to mine or worse.” Mr. Hyde could not be reached for comment by phone, by email or through his website .