Interacting with followers on Pinterest is a cinch. When you log in, you'll be directed to your home page, where you'll find loads of things that people you're following have pinned. You may not be interested in following all the boards your friends create, and Pinterest gives you the option to unfollow individual boards.
If a friend pins something you like, however, you can interact with that pin in several different ways. First, you can "like" what they've pinned. This is a fast and easy way to give your followers kudos for posting something you like. Second, if you really like their pin, you can leave a comment. This is a more personal and interactive way to communicate with someone you're following. Finally, if you really, really like what they've pinned, you can "repin" it to one of your own pinboards. This will enable people who are following you to also see the item. They'll also be able to click through to the original pinner and see the rest of his or her pinboards.
With all of this pinning and repinning, it's easy to let your pinboards get out of control. We talk about organizing your pinboards next.