Robin Good: Shared Count is a free web app which allows you to measure instantly how many FB Likes, FB Shares, FB Comments, Tweets, Google +1s, Diggs, as well as StumbleUpon, LinkedIN, Delicious, Reddit shares and pins (Pinterest) any web page has received.
You can also add a batch of URLs and see them compared in tabular format: http://sharedcount.com/dashboard.php
Free to use. No registration, no download.
Try it out now: http://sharedcount.com/