Both Library Thing and Shelfari are useful to me in three ways. First, I am an avid reader who loves connecting with others over shared interests. I joined Shelfari about 3 weeks ago and have logged on almost every night to see what my friends are reading and get recommendations. Another reason I use it is to look up books my students are reading or I am thinking about using in class. There are groups for children's books that people of all ages post to. Finally, as a future librarian, I know that I will not have enough time to read all the books in my library. If I really need to gather information, several reviews by library groups will give me a better insight than an Amazon book review.