This is such an unhelpful answer that it almost always worthless. The utility of social networks for contact is unmatched. One profile, ideally locked down how you see fit, that follows you for as long as you allow it to follow you. The response to this is usually that there nothing wrong with phone numbers or email addresses. Except there are.

Phone numbers change. This is less frequent now that we have mobile numbers, but they still change. Email addresses can also change as people move through different phases of life. Hell, email seems to be becoming unreliable as calling since unsubscribing from mailing lists you never joined doesn't seem to work any more.

I get it. Facebook is evil.