Facebook is receiving criticism for its use of phone numbers submitted by users for two-factor authentication.
Now, it seems, you can't opt-out.
It also seems that Facebook has allowed people to search for phone numbers, even if its hidden in a profile. It's still hidden, but it's a bit pointless if you
It goes on: If another person allows Facebook to look up other contacts, and your contacts has your number, it'll be possible to look it up. This is not new, but only adds to the search issues as many people may not even be aware of this.
Apparently, if you haven't already done it, check out your settings as the default visibility is "everyone." Switch it to "friends"
I feel this'll very soon fall foul of the E.U.'s GDPR