Yes, but not a lot. I’m guessing around 5 million? (I say guessing because I can’t remember where I read it). They don’t seem to have a mobile app anymore (they used to).
MySpace and Friendi.ca seem to be your best options.
Edit: With a group of 800, you might want to consider hosting your own instance to alleviate the confusion of which/where to go (Friendica). You don’t need to do it yourself, @communick.news “provides managed hosting” and save yourself a headache.
In June 2011, Specific Media Group and Justin Timberlake jointly purchased the company for approximately $35 million.[16] On February 11, 2016, it was announced that Myspace and its parent company had been purchased by Time Inc. for $87 million.[17][18] On January 31, 2018, Time Inc. was in turn purchased by Meredith Corporation,[19] and later that year, on November 4, 2019, Meredith spun off Myspace and its original holding company (Viant Technology Holding Inc.) and sold it to Viant Technology LLC.[20]
Just don’t tell the people from Boston…