It's not so much about which apps you are using, you don't want to isolate yourself. You use whatever communication channel your friends/colleagues use.

For me turning off Wifi, and consciously turning it on a couple of times a day is the big difference. Just like checking mail 15 years ago. You decided when to open Eudora or Hotmail, checked mail, en closed it again.

For me any app I use is like old school mail checking. I decide when to check. My friends know it can take a couple of hours or sometimes days for me to respond. If something is really urgent, they call me :)