I have read stories here of people popping up on each others face book accounts because the phone numbers are connected to facebook.
Keep everything private.
Personally a man asked me to text him when in Belfast, he is a good reg so I did.
My "Hello I'm in Belfast" msg popped up on his phone while his grandson was playing a game on it and grandson wanted to know who the nice lady is
Emails should also be separate, I got an email attached to someones face book account and all his family etc were showing.
Separate even if you have no partner is the way to go imo.