With friends who live close by, we don't interact online. Instead we schedule dinner or make plans for weekends.
With friends who don't live nearby, I don't talk to them as often. I still have my FB account but I don't follow anyone on FB, so my News Feed is empty. I keep it alive for FB messenger, which I use to chat with some friends occasionally. Or if I'm traveling nearby, I'll let them know and schedule something. I used the word "offline" in a sense that I don't subscribe to people and I don't broadcast my activities.
I'm guessing all your friends live nearby? If not, how do you keep in touch with them 'offline'?