lib.reviews - a free, open and not-for-profit platform for reviewing absolutely anything, in any language.
Goodreads - See what your friends are reading.
Riffle - Just good books and the readers who love them.
CNET - CNET is a website that provides you with the latest tech news and tech reviews. The homepage of the website is a huge feed of the latest tech stories that would take you hours to sort through. Read more about CNET.
LibraryThing - A home for your books.
Anime-Planet - Anime and manga database, recommendations, reviews and more!