I wrote a blog post awhile back called the anatomy of a blog post where I outlined what I believe the layout of your blog post should be for ease of reading online. In short: Keep your posts brief and scannable.
Here are a few tips on things you can do to make your blog posts as easy to share as possible:
1) Enable social sharing
There are many plugins (AddThis, ShareThis, and Shareaholic to name a few)
I’m a big fan of the layout that allows people to share to the most common networks with one click.
2) Use a photo or video in every post
This makes the posts more visual on Facebook, Google + and especially on Pinterest. People won’t share a post on Pinterest if there is no image or video to accompany it.
What entices you to share a post?