The whole FB thing is an invasion of privacy regardless of settings.
I have a FB account for work-related business, use a work email address too, but refuse to link my phone number. I decided to see who 'people I might know' might include, and fortunately none were WGs. In fact very few women, just one 8/10 girl at work with a gorilla BF.
To my mind, my decision to have a punting phone, a spoof email address linked to AW and always using a different to normal browser that deletes all history cookies and whatever on closing seems to have paid off, as the connection cant be made.
I just worry how fecking clever these algoryhtums used by FB, Google et al are, and that one day I will get caught out.