If you are using WordPress, there is a great plugin called OnlyWire that will automatically submit your posts to the social networks you are subscribed to. You register at their site and enter your details for any social networks you belong to, then install the "bookmark and share" plugin. When you publish a post it will automatically be submitted to your subscribed social networks. There is also a button that sits below your posts allowing others to share your content. This is a terrific way to popularize your blog.