Not at first. My first step would be to get them to seek appropriate counselling. If that didn’t work then yes I’d have to inform the company. What does this have to do with whether a Whats App group is social media or not?
The key point is that he reached out to someone, whether it’s friends or a professional doesn’t matter provided he gets the help he needs.
By the way, a hard copy photo can also be spread and end up in the public domain. It’s not actually “social media” that is the problem, sharing any compromising information, in any form, to anyone, removes control from you and is a risk. Social media just happens to be a convenient method for sharing and many people have little understanding of the privacy or otherwise of their social media accounts.