Depends on what you mean by mass scale. There are several strategies for hitting a Pinterest in IM, while all of them will require some patience and time to bring results. Most of people do follow/unfollow with hundreds of accounts. I am kind of sceptic about this strategy as I never trust that building something big won't get you knees down one day. The best way to make money on Pinterest is bring a medium to high quality content, which you can obviously steal there=)