Actually, Yes I am. If I attend an event, my friends and acquaintances will often upload pictures of me. I do not have a Facebook account, but they are known to operate shadow profiles.
I wonder how detailed they are. If a few friends of yours have your name and number in their phone, and they have WhatsApp, Facebook (which owns WhatsApp) already has your name, number and a network of your friends (especially if those WhatsApp users also connected their Facebook account, or entered their WhatsApp ID (their phone number) to their FB profile.
And people say Facebook allows companies to upload their customer data to Facebook so they can be targeted through ads on FB, so it would be possible (in theory, not sure about the practice) that Facebook has things like your address and income level as well, for example if you ever filled a marketing survey.
And people say Facebook allows companies to upload their customer data to Facebook so they can be targeted through ads on FB, so it would be possible (in theory, not sure about the practice) that Facebook has things like your address and income level as well, for example if you ever filled a marketing survey.