You exist.
They don't need you to participate. They need your email or your phone number that can link you to the rest of the matrix. With a mobile app, they get your phone number automatically.
Everything else you post is icing on the cake. They don't need your relationship status. They don't need your address. Maybe your phone number will link to one, but they don't need it to be accurate.
Now you're part of the data pool. You're one more audience member. You're fueling facebook and their profits.
You're being sold.
Not only that, non-participation grants a false sense of security. As does the data they ask for; as if the data you post is all that they know or that is being shared. As do all their privacy settings. As does deleting your account. Facebook might mark you as deleted, but your data has already been used, sold, and transferred to 3rd parties, none of whom are inclined to delete your data.
If the data hasn't changed, and you haven't changed, then deleting yourself from facebook doesn't change anything.
