Two things: I have to be on because I can't do my job well without it. But to your other point, you already have a network of friends and colleagues you can connect with in other ways. Imagine that you didn't, and Facebook offered you one.
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I won't presume to speak for Jillian, but it seems like she wasn't talking about "most people," merely many. (sorry, it's not you, i'm seeing a lot of people with This Take who seem weirdly blind to this.)
(but to your point i too would love to read the stories of people who can't quit!)