In cases where its realistic in the current world to get privacy, I'll take everything I can get: eg I still think there's a reasonable shot at eventually making cities enforce rules that prevent people from bringing a drone to my window on the 5th freagin floor to take pictures of my bedroom, and I'll certainly push for that to death.
I don't think that's the point; I think the OP is saying that in OP's particular case, the marginal benefit of Facebook privacy is much smaller than the marginal benefit of privacy in other aspects of life, and the lack of privacy from these various other aspects seem to be here to stay, therefore why worry about something relatively trivial like Facebook?
There may be other fallacies in OP's assumptions of course, but those notwithstanding I agree with the underlying logic. E.g. if I deem riding motorcycles an acceptable risk, then arguably I shouldn't spend energy worrying about whether my airplane will crash.
So if you can't have perfect privacy, you'll have nothing at all? That's quite an all-or-nothing way of looking at this issue.
Well, I was out today when it started raining. I had my raincoat and my wellies in my rucksack, but I didn't have any water proof pants. I'd like to be dry, but unless I could get water proof pants, I'm not going to be dry, so ...