We have articles on our site dedicated to different methods of reach calculations: Page Reach: Page-Level Reporting Post Reach: Post-Level Reporting Paid Reach: Why Your Reporting May Miss the Complete Picture
Jon wrote an article outlining the differences between different click metrics here.
You can use Ads Manager to analyze and compare audience sizes between these platforms, though it requires a bit of a manual approach. We have an article outlining how to do this here.
You can apply Breakdowns in Ads Manager to do this. More info from Facebook is available here.
Meta has an explanation of how attribution works on their platforms here. Jon also wrote an article about conversion attribution that you can read here. It’s important to note that due to differences in attribution models and methods, Facebook’s reporting may not match other channels, such as Google Analytics. This article on Social Media Today… Read more »