Facebook
From A. Kadri Turker, 3 Years ago, written in SQL.
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  1. SELECT username, emailaddress
  2. FROM i_users
  3. WHERE userId IN (SELECT userId
  4.                  FROM (SELECT userId, COUNT(userId) AS mcount
  5.                        FROM i_user_login_logs
  6.                        WHERE username <> 'Administrator'
  7.                        GROUP BY userId))
  8.                 GROUP BY userID
  9.                 HAVING mcount = MAX(mcount))