Some readers will naturally be more or less active in evangelizing the work you do, but particular communities, topics, writing styles and content types regularly play better than others on the web. For example, great infographics that strike a chord (like this one), beautiful videos that tell a story (like this one) and remarkable collections of facts that challenge common assumptions (like this one) are all targeted at audiences likely to share.
Creative development of content which can enforce visitors to share with their friends always result in good marketing tactics. Good thing about this is there are already tools and application available to share the content with one click only.