Add widget to blog that allows social media sharing of posts

I'd like a widget added to my current blog (which is through a service called [login to view URL]). My blog is at: [login to view URL] I'd like the little icons for the main social media platforms (Facebook, Twitter, Tumblr, Pinterest, any others you think would be helpful) added to the bottom of each and every of my blog posts so that readers can easily share my posts. My website is built on the .NET platform. Thank you, and I look forward to working with you!