You can create checklists and get items added by other users, and they can upvote or downvote the items. You can sort the items based on upvotes, mark them done, or simply print them and do whatever you want with them.
This is still an MVP; I just launched it, and there isn't much content. Feel free to add yours. Some of the features are yet to be implemented, such as comments, shortlists, etc.; your feedback and suggestions are welcome.
Just like any social network platform, I think people would do it simply for likes and upvotes and the dopomine that comes with it, but yeah, I'm thinking of adding some sort of points system like karma, reputations, etc.