There was a sense in "pride" when you gave someone your number and they would say "Isn't there meant to be a few more numbers?"
I don't think I have ever received or sent any messages, or met anyone else who used it.
On the plus side, my Slashdot number is under 7000, so that validates my life a little, and OH GOD THE RESET PASSWORD LINK EMBEDS YOUR OLD PASSWORD IN THE RESET URL IN THE CLEAR I need to wash my brain out now...
It was stolen because of a weak password on the account.
This is how I started my way in cyber security, thanks to the frustration and further research on how that happened.
Same sort of thing happens with low SteamIDs.
You're implying that there's a search page where you can search accounts. I forgot what's number of my account and am curious if there's anyone who that I know that still uses it.
Looks like my contact list was wiped at some point over the years, though.
And looking it up reveals I was stupid enough to fill in my birthday correctly for it, which still displays publicly to this day.