[LetBinding]

This is interesting.

I signed up with a new email address. Put in my phone number. I _do not_ have this phone number on my primary account. Now on my dummy account, I get a long list of friend suggestions, most of them from my primary account, and some unknown.

My dummy account and primary account are not linked in any way. All cookies cleared. So how did my dummy account suggest so many friends from my primary account? It didn't before I entered my phone number in my dummy account. Some of the friend suggestions live in other countries, and I doubt they would have my US phone number.