That's the typical response. Except that reality doesn't concur. People who stop using Facebook end up excluded from social circles. Not through malice, but because it's harder to be in contact with that one offhand person who Doesn't Even Own A TV--er, sorry, Doesn't Use Facebook. They're sand in the social gears.

(The self-centered prick's response of "then they're not real friends"--which I am addressing because it frequently comes next--willfully ignores that said self-centered prick is making it harder on everyone else to include them. They get excluded because they're being annoying. You have to give to get, and part of your giving is not making everyone else's life difficult because you're frothy about a web company.)

In the U.S. at least, if you have a basic appreciation of people you have formed friendships with over the years, if you value interacting with them over that self-centered Facebook froth, it's not feasible to ditch it. But you can still express a desire for it to improve.