It allows you to build a virtual bookshelf of books you have read, are reading and would like to read; rate your books and share them with others; check out others' recommendations and even join groups of readers with similar interests.
Social networking sites have most definitely not worked for me in the past.
I joined Facebook after
I found the most interesting feature to be my friends' updates - one friend, in particular, could craft some hilarious updates in the confines of a line or two. Other than that, I joined the Support the Canadian Military group, scribbled the occasional note on the occasional wall; spent a fair bit of time taking care of my 'pet', wandered off and patted others' pets to earn money to feed mine and decorated for Christmas (this would have been a couple of years ago).
Shortly after that I discovered blogging and my visits to Facebook became fewer and further between. Until I stopped going completely. And when it looked like someone might have hacked my account, I made a quick exit.
Blogging was so much more interesting and fun; there was absolutely no comparison in my mind. And, amusingly enough, when I closed my Facebook account, I had the same number of 'friends' as when I started three or four months previously. I just couldn't get into that aspect of it; it just wasn't my thing.
But I am an avid reader, no doubt about that.
So I decided to join up. How long will I last?
We shall see, I suppose.