MySQL - Where IN together with GROUP_CONCAT

SELECT DISTINCT
  li.auto_id
FROM
  links AS li
  JOIN group_data AS gi ON
    li.auto_id = gi.autoid AND li.user_id = gi.userid
WHERE
  gi.groupid IN
  (
    SELECT
      CAST( GROUP_CONCAT( gf.groupid ) AS CHAR )
    FROM
      group_followers AS gf
    WHERE
      gf.userid_ext = '1'
    GROUP BY
      gf.userid_ext
  )
  AND li.keyword LIKE '%shiba%'

gi.groupid IN
(
  SELECT
    gf.groupid
  FROM
    ...
)