What’s the ideal message length?

Facebook: 40 characters

Tweets: less than 100 characters

Blog posts: seven minutes

Subject Line: 28-39 characters

Video: between 30 seconds and  2 minutes. People love video, but your customer’s attention span is dreadfully short. Wistia found that the completion rate for 30 second video is close to 90 percent, but it drops to barely more than 50 percent if the video is 2 minutes. Of course, completion rate might not be critical, as long as customers get the important bits of your message and are happy with your video. But if the call to action is in the last 10 seconds and no one ever watches that far, you have a problem.