I've seen a couple of versions of this one floating around with different words ('FACT', 'UNICORNS', 'FENCE', 'BANANA', 'ICON ME!' etc.). Here's an example of the UNICORN variant from eurydice72:
1. Reply to this post with "UNICORNS", and I will pick five of your icons.
2. Make a post (including the meme info) and talk about the icons I chose.
3. Other people can then comment to you and make their own posts.
4. This will create a never-ending cycle of icon glee.