Finally!
492 karma · joined November 8, 2012
Also, sequential ID may reveal some information you may not wan to share. If someone's user ID is 1234, that may be an indication the service has at least 1234 users.
https://www.forbes.com/sites/emilycanal/2016/03/09/the-citie...
http://stackoverflow.com/insights/survey/2017/#technology-mo...
(1): https://techcrunch.com/2012/02/01/facebook-1-billion-profit/