You can insert a PDF into a PowerPoint either as an object, and then set it so it opens when you click it.
You can only upload a PDF to Facebook groups and business pages, unless you convert the PDF to an image file.
If you have a PDF that you want to share with the world via Facebook, you might hit a snag. You simply can't upload that file type to Facebook as a photo. Thankfully, there are a few ways around that ...