Gigya – Widget for Bookmarking, Emailing, Posting
The image shown below is from this blog which is active now and you can try it. Just go to an individual post and you will find this below the post.
Its very simple to install, just need to add some bit of code to your blog header and the single post file in the templates. Before grabbing the code, you can customize the widget according to your taste and the template of your blog.
Earning from Gigya Widget
Gigya also has an earning program which is free to join, but need to apply for this program. I am not much aware of this program as I have not tried. If anyone has used it, please share your thoughts.