I agree. To quit social media for selfish reasons is really not killing your ego; it's nourish it. Social Media should benefit all and it always comes at somebody's expense.
Not sure what you mean here. There is no obligation to use social media. Quitting it is a healthy move. It seems like you think acting for your own good is the same as selfishness, which would be ridiculous. You have a moral obligation to act for your own good. It's just that people often have stupid ideas about what it _objectively_ means to do that. True selfishness is not good for the selfish person.