text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE user_profiles (followers INTEGER, UID VARCHAR); CREATE TABLE tweets (followers INTEGER, UID VARCHAR)
  ### Question:
  Find the average number of followers for the users who had some tweets.
  ### Answer:
  SELECT AVG(followers) FROM user_profiles WHERE UID IN (SELECT UID FROM tweets)