Not only do I use my pretty Rolodex to keep track of my hundreds of internet passwords, I also use it to keep track of my social media ideas. I have Rolodex dividers for every month and an "evergreen" divider at the end. Whenever I get an idea for a blog post or an Instagram post, I jot it down on a Rolodex card and file it under the appropriate divider.
I just love turning that handle and watching all of my ideas flipping past. Rolodex for social media ideas - Use # 2.