On Facebook, an advertiser needs to keep the creatives fresh in order to engage the audience. It’s a god idea to test different elements that make up an ad (like the image, body etc) to check which one is performing well. And at the most basic level, that is what the multivariate tool allows you to ...

You don't explicitly create ad groups in Facebook campaigns. However, when you create an ad, an ad group  is created that includes both the ad (ad type, ad title and body text, image, and destination URL) and its target audience. The ad group name is retained when you edit the ad elements and target...