BookArmy is a social network for book lovers, and it wants to make sure you "never read a bad book again". You can read and write reviews, share your bookshelf, and connect with others.
BookArmy has something to offer avid readers, whether or not they sign up for an account. Without an account, you can still browse book reviews, look at author pages and videos, and read over the group and author-led discussions. With an account, you can create a virtual bookshelf of your favourite books, write and share your reviews, and participate in the group discussions and events. If the suggestion services don't produce anything intriguing, you can browse books by the network's most read, most popular, and by author.
For more book recommendations, albeit without the social component, make sure to check out WhichBook to get your fill of reading suggestions.