Are there are job offers on Facebook? (That's a genuine question; I don't have an account.)

Perhaps some service providers are only (or primarily) contactable for complaints via Facebook (and maybe Twitter and a couple of others), and therefore to contact them you need an account with one of those companies.

So perhaps to participate in society without a disadvantage, you need an account with Facebook Inc, or at least I think that's the idea.

(Also, there are alternatives to oil! If you don't like the service provided by Oil Inc, you can buy your energy from Electricity Ltd instead.)