List the official full names of 10 legislators who have a YouTube account but no Instagram account.
have a YouTube account but no Instagram account refers to facebook is not null and (instagram is null or instagram = '')
SELECT T2.official_full_name FROM `social-media` AS T1 INNER JOIN current AS T2 ON T1.bioguide = T2.bioguide_id WHERE T1.facebook IS NOT NULL AND (T1.instagram IS NULL OR T1.instagram = '') LIMIT 10