Did you know that among the five most popular words on Twitter are the words please and retweet? That tells you something very important. If you want to encourage people to share your work on social media, sometimes all you have to do is ask. It’s a call to action, social media style. Most people can’t resist a heartfelt appeal mixed with a little politeness. That’s why one of the things it’s most important to master in your content marketing is the call to action.