Think about how many photos you've revisited, movies you're re-watched, etc. compared to articles you've re-read. Also, consider how much easier it is to share a photo with a group of friends than it is to get the same amount of people to read an article.
Whether you want users to click, view, read, comment, Tweet, share, post, email, or Pin to Pinterest, the evidence clear: visual communication is the best way to drive engagement and grow your audience.
People love to share things that bring them joy and happiness, and tend to pass over things that are going to ruin their day. Make your viewers smile, laugh, or be surprised, and they'll want to do the same for their friends... by sharing your content with them.