BS. I don't care if you are in the same room with other people. If you are on your phone chatting, typing, etc you are not engaged with the people in the room.
Good, now back to making plans to be by myself.
At the very least it sounds like they've failed to account for the fact that many people spend their "direct social contact" time browsing the web on their phone.
It displaces *direct* human contact anyways, for what that's worth.
Actually, it's the interactions with your non-family and non-close friends that matters the most to developing good social skills and reducing social anxiety as well as for growing a social circle. It is this type of interaction with people you aren't comfortable with that can bring on social anxiety and cause confrontations that people are unsure of how to handle that social media allows people to avoid and by avoiding it they do not develop needed social skills. This is a huge problem.
People who only have a very small group of friends and family that they get their social interaction from may not suffer from depression because psychologists may determine their level of social interaction is healthy but their situation is fragile. If people die or move away that's a significant event that the person may not be easily able to recover from because they don't have well developed social skills and low social anxiety. It also makes it very difficult to make new friends in significant others and in communicating effectively in a work environment.
I'm surprised at the discussion surrounding fears of not associating with friends/family. That has never been the issue for most people. The issue has been people not associating with anyone except their friends/family because they're no longer put into anxiety prone social situations since social media allows people to carefully select their social engagements to only be ones that have 0 challenge to them.