I just came across a nicely put together infographic on social media and I think a lot of authors could benefit from it. I get a lot of questions about promoting books and this is a good guide for how to create the perfect post. While it has information about Vine at the end most authors can ignore that network for book promotion since there really isn’t a use for that as an author. 
How to create the perfect social media post is an infographic that was produced by mycleveragency