Example of how it works:

The first person posts something like:

"If you like Hotarubi no Mori e, I think you'll like Natsume Yuujinchou!"

Then the next person might post:

"If you like Natsume Yuujinchou, I think you'll like Mushi-shi!"

And so on. The next person would post "If you like Mushi-shi..." etc. Have fun! I hope my explanation was clear... if you spot any flaws in the rules of the game, please tell me.