This release includes two new command line options and similarly named Twarc methods: `friend_ids` and `follower_ids`. You can use them to lookup user ids for accounts that follow a given Twitter user, or that a given Twitter user follows.
% twarc.py --follower_ids HillaryClinton > followers.txt
or
% twarc.py --friend_ids HillaryClinton > friends.txt
Thanks to dchud for the contribution!