A sticky widget in my social media machine.

Shhh! I'm duckin' the fuzz.
If they ask, you haven't
seen me.

Is there a way to turn off or block 'suggested friends' on FB?  Some peeps I don't add because... well, I know I would offend them accidentally and these are good people, people I like.  I'd never want to hurt them.
I borderline on NC-17.  They're more PG.  Anyone else in this predicament?  What do I do?  To block would be inappropriate and rude but not to add also feels wrong.
Are there degrees of anonymous?  How can I be me without being totally witness protection program?  (Which is a little bit of the reason for certain things but unrelated to this particular topic.  Long story.  Tell you later.)

WWMMD?  (What would Miss Manners do?)