Hay @sesangsokuro,

thank you for your Feedback! =)

Actually, "follow" and "unfollow" are basically done with a "custom_json_operation" as you can see here.

Beside that there is a "follow_api" which a Steem Node can enable. This plugin allows you to get followers and some more stuff. Sadly, the follow_api is not implemented yet in SteemJ. I've created a GitHub issue and will try to implement this as soon as possible.