Facebook Audience Insights (#23)
Facebook Audience Insight are available inside of the business manager in Facebook and let you explore all of the audiences you can market to on Facebook— that is, the entire world of Facebook users.
Facebook Page Insights (#22)
If you have a Facebook Page, it comes with a powerful toolkit to show you analytics about your views, engagements, videos, and a lot more.
Facebook OG Debugger Tool (#21)
Use the Facebook Open Graph Debugger Tool to check the preview (title, description, image) of a link you are sharing on social media. It will force Facebook to re-fetch the content, even when Facebook would usually cache that content for up to 24 hours.