As a marketer, you'll need to know how your advertisement dollars are performing on each channel and we often use Google Analytics to analyze them. You may set up goals, conversions, and eCommerce tracking within Google Analytics to determine the sales funnel and also determine where users are dropping off within conversion paths. Google offers auto-tagging within its advertising channel (Google Ads) to make it easier to monitor the performance of its advertising platform. Facebook on the other hand, provides it's own performance metrics through the Facebook Business page.