Digg.com is one of the largest social bookmarking sites on the Internet. If many users were to Digg your post, it could drive a ton of visitors to your blog overnight.
This video shows you how to add a Digg button in your blog post.
also Check Out, Complete WordPress Website Development Tutorial: https://goo.gl/7wlI55
Solution of all Issues related to WordPress: https://goo.gl/b2Z8qZ