Earlier quoted context omitted.
This approach is one of my biggest annoyances because it's not the same. You're asking for them to give you something but they're not getting anything in return. When people use Facebook/Google etc. they get a service that they end up valuing very highly in return. That common argument of "Give me your phone and PIN" is so pointless because people wouldn't even give that stuff to Facebook if it didn't give them anyth…
Just change the hypothetical into: "Would you give me your home address and keys so I can drop off a newspaper on your coffee table each morning?" Yes, it's a bit long, but it takes into account your concern of giving data and not receiving anything in return. And Facebook/Insta/Social media in general is very similar to having a newspaper available at your coffee table each day.
... Oh. And BTW. I'll be making some copies of your keys to give to a bunch of others interested in placing adds on your coffee table (or so they claim). I'll also go through all your drawers to see if I can't find any other keys/access cards/... to gain access to your office or your colleages' offices, friends' or family's homes, etc. just so I can provide them with the same adds "service" as I intend to provide you. Of course I don't remind you of any of this. Nor do I tell your colleagues, friends, family, etc. After all. What you don't know will aid me and what they don't know will aid me. ;-)