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This has been discussed before; "better" != "only".

If the target is to have a contact, an email or a phone number are sufficient.

Also, it's fallacious to think that emails/phones are subject to change, while a Facebook account isn't - some people close it. Especially emails nowadays are used for a lot of services, so people stick with them for a long time, more than the past.

Email, text, phone call, all better messaging services than Facebook.

As has been said before: e-mail. I moved to Canada from Spain but go back from time to time, on holidays. Every time I go, I pick up the list of people I want to see and send them an e-mail. Has worked every single time.