I think you just have to accept that facebook, in general, has a 'share to a wide audience' as a default design stance. That stances enhances general viriality

I think you just have to accept that facebook, in general, has a 'share to a wide audience' as a default design stance. That stances enhances general viriality and usage of their program and thus increases their user base. Same with never deleting anything, recording everything you do with like buttons around the internet and making it difficult to do such things as 'delete everything older than 3 months' with one click. Storage is cheap and the more information they have, the more valuable their product is to their customers, marketing firms. Have a locked down by default stance just decreases the virality of their social product. The amount they piss off is smaller than the amount they gain unfortunately.