e.g. videos on Facebook's news service have increased by 3.6x
However, the statistics that tell you about user reaction to images and videos are key to realising how powerful (and increasingly necessary) visual content is for your online content. For example, the fact that posts with videos attract 3x more links than those that only have text.
Of course, none of the statistics PROVE that adding images or videos will increase the attraction of your posts; it could just be that people who write the most interesting posts are also those that care about illustrating them. Given the way we have evolved to respond to movement and colour however, it is a pretty good bet that attractive images or videos will help you attract more attention for your content.
Have a look at all the statistics in the article and see which ones are relevant for your content marketing.