[zapzupnz]

This. When you try to tell people this, especially here on HN, they say "well, people should just change to suit you or they're not worth contacting". The arrogance of the technically minded can be astounding; it took ten years to get our acquaintances on Facebook, they're not going to change just because we say so.

[wasdfff]

Sure, you won’t get passively invited to things, but if you regularly are keeping in touch with people they will invite you to things anyway.

[ahje]

That's the problem: pretty much everyone I know -- including my mother, who started claiming I was hard to get hold of when I asked her to call instead of messaging my wife on Facebook -- stopped keeping in touch. Most people I know simply don't want to talk over the phone, send SMS'es, or use emails ("email is for signing up to various services and resetting passwords").