Kidizen sellers will comment on each others listings (this could be any words, an emoji, or a hashtag) to bump that listing to the top of the listings feed in hopes of creating more visibility for that listing. Some sellers have created bump parties and groups to trade commenting on each others listings in a formal group. You can find these in the app by going to the search bar on top of the listings feed and typing in "bump" or "bump group" and it will bring up the listings that are made to sign up on. Each group is different and has it's own set of rules, however all focus on commenting on each others listings. While some some sellers think that bumping helps with visibility and sales, others don't think so. So you definitely don't have to bump but if you have the time, it's a great way to meet the other Kidizen mamas!