Each time you contribute information such as ratings, tags, comments or summaries, you receive community credits. Community credits are a way you can keep track of your contributions to the library’s catalog, and to the wider community of library users.
To see the details of how you earned your credits, click My Account, and then click Community Credits.
The simplest way to start earning community credits is to add titles to your shelves: each star rating, tag or other comment that you add earns one credit. When you create a list of at least five titles, you earn 5 credits.