A number of social networking sites that focus on reading can be found online. Media specialists love to promote reading and may want to explore sites like Shelfari. You could promote professional reading for your staff, for parents, and for students. If I were a media specialist, I might want to highlight the top reads in the media center this month, or promote specific books.
And of course this tool is not just limited to the media specialists. Teachers can use tools like this to promote subject-specific reading. Principals may want to recommend books to parents. Guidance counselors may want to have recommended readings. I encourage you to explore age-appropriate social sites that promote reading!
You could include a widget on your site, like the one you see below from my list of books I plan to read. Your bookshelf widget can display books you have read, are reading, plan to read, are your favorite books. You can even assign tags to books, like "SummerReading" and display just the books with that specific tag. You can also customize the look of the widget on your blog as well.