Hi,
I have worked with Twitter API, I can do this job for you. To show you my twitter skills, like 1 week ago I did a twitter account that send messages every 45 seconds to an unique user (see at @just_be_happy__ ). In your project, I can follow people who are interconnected with the themes which you want, wait they follow you back then unfollow them if you want to. Please, contact me to discuss my idea to your project.