Almost a decade later, I’m still waiting for an independent reading and reviewing social network.  Perhaps it will never happen. Maybe anything that gains traction will just be bought out like Goodreads etc. But a person can still hope.

A fairly recent entry to the very short list of possibilities:

micro.blog has some book sharing features, using the book📚 icon as a tag. 

http://micro.blog/discover/books

Having said that, I’m reminded of the “indie web” principle that the whole Internet is the true social network. Everything else is just a walled garden.

Jeff Jarvis said it way back in 2006:

The internet doesn’t need more social networks. The internet is the social network.

http://buzzmachine.com/2006/08/19/looking-through-the-wrong-end-of-the-wire

If so, there’s no need for negatively. Just the need to build, share and link.