TopMoviesLike - Top Movies Like is a free tool that helps you to find similar movies to any movie!
Goodreads - See what your friends are reading.
BooksLoom - There are more than half a million books published each year in the US alone.
Readernaut - We are a small community of readers, sharing our adventures and supporting each other as we persue a life of learning.
aNobii - aNobii is a social network for listing books, sharing insights, and meeting people.
Riffle - Just good books and the readers who love them.