Among legislators who have an Instagram account, list down their full names and nicknames who have a Thomas ID of less than 1000.
have an Instagram account refers to instagram is not null; full names refers to official_full_name; nicknames refers to nickname_name; Thomas ID of less than 1000 refers to thomas_id < 1000;
SELECT T1.official_full_name, T1.nickname_name FROM current AS T1 INNER JOIN `social-media` AS T2 ON T2.bioguide = T1.bioguide_id WHERE T2.instagram IS NOT NULL AND T1.thomas_id < 1000