Database: social_media
Question: Calculate the average number of male users who posted tweets in a week.
SQL: SELECT COUNT(DISTINCT T1.TweetID) / COUNT(DISTINCT T1.UserID) / 7 AS avg FROM twitter AS T1 INNER JOIN user AS T2 ON T1.UserID = T2.UserID WHERE T2.Gender = 'Male' AND T1.Day BETWEEN 1 AND 31