A/B testing
Here's how we do it. We take our original, let's callit A. And we take our new version, let's call it B. And weshow the different versions randomly to differentsocial media users and see which one gets moreclicks. So, basically, A/B testing is trial and error, butyou get data to show you what's working or not.
(The experiment looks complex – 3 variables and 3 audiences – but really it's just a series of A/B tests being carried out at the same time.)