I have been thinking about this a bit as I move away Gmail and Outlook accounts. I have a lot of people in my contacts and I have weighed whether to move them or not. My rule of thumb right now is that I ask is this a person who I would want to know any good or bad news in my life? If so, I keep them. If not, I let them go. It is hard. And your circle changes over time. I am thinking the same thing about Facebook as I put it into cold storage.