It's getting harder every day to not use it. I would be with you if Facebook didn't have such a big impact in our lives as it has already. Of course because we collectively let it do so, but in the end, the individual has little recourse.
Increasingly webpages use some kind of "Facebook login" process. You want to join them, you need to have a Facebook profile. They outsourced the "hassle" of user management. And simply shrugging and forgoing using them works only if you're not involved in media or PR issues or have to find contractors online for work. Also more and more bosses want to see a Facebook profile before hiring you and not having one is seen as "odd". Got something to hide that we can't see your Facebook profile? Because it's just so unfathomable that you don't have one.
That thing is creeping deeper and deeper into our lives, whether you like it or not. Even whether you use it or not. And not using it makes you more and more of a pariah. Because "why didn't you come to the party, everyone was there, I posted it on Facebook for all my friends" is only the start.