I happened across a really great site the other day and would equate it to Facebook for readers and writers. It is wonderful. Basically, you can join clubs, shelf all the books that you've read and want to read, go through reviews, and post your own writing for others to read and critique.
I highly recommend you check it out. It might take a few visits to get the hang of it and explore all its potential, but I much prefer it to Facebook which is, quite honestly, getting a little old.