A Brief Guide to PPC Metrics - Important PPC Metric You Should Be Tracking. There is nothing else on the market that compares to PPC. And TV advertising isn't as effective at attracting new customers. They are, however, not without problems. There are a few issues that need to be addressed. Understanding AdWords and Facebook Ads can be challenging. For example, they provide data on hundreds of indicators. How are you expected to know which are the most important?