How to add AddThis Social Media sharing tools to Drupal site?

If you own a blog or website, Social Media sharing tools are must-have these days as one cannot ignore tons of users on Social Media. Most internet users nowadays have Social Media account be it Facebook, Google Plus, Twitter or any other social media platforms. And as a blogger or owners of websites, we cannot ignore the fact that our visitors may be willing to share content from our website and blog to Social Media platforms. So, if we place Social Media sharing tools on our blogs or websites for users to use, it is free promotion for publishers. There are tons of potential for traffic through Social Media platforms. So it is very important that Social Media tools are added to websites and blogs.