I think that most of us like to help other people; especially when it is not too difficult to do so.  If you want people to help you share your blog content, make it easy for them.

A great way to do this is to add a tweetable link. This link is preformatted with the text, a link to the post and your Twitter name.  If readers like your idea and want to share it all they have to do is to click your (tweet this) link and hit send.