I searched my number(s), no hits. I did a +/- a few numbers, and there is a hit. The message is though: "Oh no — pwned!" The only information exposed to me is

I searched my number(s), no hits. I did a +/- a few numbers, and there is a hit. The message is though: "Oh no — pwned!" The only information exposed to me is that the person with that number, has a FB profile. If I am to trust FB (which I don't - for nothing) is that FB has this person's number and lost it. I place no reliance to anything that FB states. For all I know that person is a WhatsApp user and the FB branch 'stole' the number and added that to their FB account (yes, I know this is not how data works, but this is how FB works). (semi-rant follows - apologies) There is a mention of 2FA/MFA in another comment. I wouldn't be surprised if FB already has a 'super profile', where all data by FB-WA-IG are merged. I believe that would be a nightmare to do, but hey, FB is good at nightmares. Edit: I feel this is a semi "Ashley Madison" moment. People who have a 'secret' FB profile may get busted by their BFs/GFs.