Nothing is better for marketing than solid data. In fact, you should see your marketing business as being data-driven. That is, if the data says a purple button is better at converting than an orange one, it should be purple whether you like it or not.
This article has such a statistically relevant sample size (100M articles!), the findings are conclusive.
This is an important read if you're at all interested in creating content that will be shared (and hopefully go viral!).