Do an experiment. Inactivate your accounts and see what happens.
I don’t use Facebook except very rarely. I use gmail for email and chat and videochat purposes. But there are only three people I chat with regularly. I use the phone, too, but as little as possible. I mostly use the phone for business and the people I care about the most.
Entertainment? Well, books and news and blogs and TV should suffice. You do not need to access those in a social networking way.
I’m not fond of “social grooming” kinds of connections with people. I like my connections either to be very deep or businesslike. I’m not good at acquaintanceship. I don’t have the patience. I want to know what’s really going on, or I don’t want to be bothered.