You can only upload a PDF to Facebook groups and business pages, unless you convert the PDF to an image file.

Involver's Scribd Facebook application lets you post PDF files to your Facebook business page to provide read-only documents for your company's customers. You must ...

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 ...