I still remember the moment I felt the shift. IRC, AIM, MSN, Pidgin, forums, they all used to feel like getting to spend time with my friends. Even GChat and Facebook Messenger weren't bad at first.
Then, all of a sudden, Facebook felt like being trapped in a small room with everyone I knew at all times, seeing that wall of green dots. It felt like a visceral push away from everyone in my life, honestly: I was no longer "going online" to signal availability to my friends, I was now simply always available to friends, family, coworkers, friends' family, etc. (or else now explicitly being _antisocial_ by avoiding Facebook.)