I looked online and found not much, and what I found has already changed. So here it is:
A Facebook Page a good way to have an extra "web site" to promote your organization and what you do to make the world a better place. However, sometimes you want to delete a page you've created. Here's how:
This assumes you are the creator, that the page was created by you so that you are the administrator:
Ads and Pages in left column
Permanently Delete this Page
If you don't have a page, you might want to consider it. Lots of people have Facebook on their PHONES! This is one way to reach out to people to talk about what you do, the people you are helping, and offer suggestions on how they can support your work.