How many users have more than 100 followers in the list created by users in 2009?
more than 100 followers refers to list_followers >100;  list created by the user in 2009 refers to list_creation_date_utc = '2009';
SELECT COUNT(T1.user_id) FROM lists_users AS T1 INNER JOIN lists AS T2 ON T1.list_id = T2.list_id WHERE T2.list_followers > 100 AND T1.list_creation_date_utc LIKE '2009%'