Building Links Through Social Media Optimization (SMO)
Share buttons let your target audience to promote your content for you. As each like/ Tweet / post / email / +1 etc, therefore sends a signal to search engines that your content is valuable and useful. If your blog is on the same domain as the website of your company, it is a great way to create the total value of your site. Internal links provide the pages on your site to share the juice links to other pages so strongly associated blog disclose their trust factor with the rest of your site.