Goodreads - See what your friends are reading.
Jiffy Reader - Jiffy Reader is a browser extension that allows you to read any website faster.
LibraryThing - A home for your books.
Short - The reading list for busy people
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Votum for Slack - Crowdsourced lists with upvotes, inside Slack