This post is a compilation of best A/B split testing case studies available on the Internet. In a way, this compilation proves that: a) A/B split testing really works; b) it doesn’t take much effort (hello Visual Website Optimizer); c) you should be doing it right now! I think case studies are an interesting way to learn about a new domain. So, consider this post as a starting point for the wonderful world of A/B split testing. Let’s start the list of case studies which you should definitely read today.