Trying to create a customizable field that can be posted to Facebook

Hello,

I am trying to make a template post for Facebook users to be able to fill in their own content and post. It is for a nonprofit walk. I'd like to be able to create a custom background and imagery along with the note "I Walk for XYZ because..." and then have an empty field where users can put their own message and post to Facebook. I know how to use forms in Acrobat but you cannot upload a PDF to Facebook. I also know how to do this in PowerPoint where I would set a Master and have users fill in a field in the "Normal" mode. Unfortunately, you can't post a powerpoint on Facebook either. I don't want users to have to use a "Save As" function to turn the item into an image. Can any Adobe Creative Suite product help me make this? Thank you