Add sharing buttons to every page of your blog and your landing page. You want to make it as simple and easy for users to share your site with their connections.
Embed add this at every point, on my blog posts I aim to have at least 2 ways for users to share our content.
For this, I’d have to recommend  http://www.addthis.com/ 100% free tool and industry leaders In social sharing.
I’d also recommend Notifia Sharing Pop up which can be displayed on exit intent, or trigger on scroll for maximum share rates.