ShareThis, the green sharing icon which you’ll probably find in most WordPress blogs, is now available for Blogger platform or any other website.
Now the most wonderful part about ShareThis - when readers share your web content, ShareThis tracks and provides your this information through charts and reports.
You therefore know what content is popular among your readers and how they are interacting with various social services.
AddThis also provides something similar in a drop-down CSS menu but with ShareThis, you can decide what services should appear in the menu and their order.
Update: If you are on Classic Blogger template, ShareThis will work without problems but for the XML templates of new blogger, consider replacing characters like <, & and > with their respective HTML codes (<, & and >).