troyhunt[.]com/the-facebook-phone-numbers-are-now-searchable-in-have-i-been-pwned/
A boatload of data from Facebook was stolen, and has been circulating recently. There's been some doubt whether this was because of an old breach or something more recent. At any rate, as Troy Hunt [haveibeenpwned[.]com] notes in his blog, "There's over 500M phone numbers but only a few million email addresses..." so if you've got a Facebook account it might make sense to check.