Digital Fife recognises the usefulness of Facebook to community organisations. Although it does not negate the importance of a website.

Facebook is no substitute for a branded, dedicated website with its own URL, that is your own internet address. A good website instantly adds perceived value or credibility to services. People want to be able to go to a website, find page.”
The reply could be “You don't have a Facebook page. Facebook has a page with your name on it.”
Better to own your own destiny and not be controlled by a fickle social site. what they are looking for, learn about the organisation, and see what they are all about. A website will allow wider consultation, through surveys, to make sure your activity best matches the needs of your whole community and lets you better publicise activities like events or meetings’

When people say “I don't need a website because I have a Facebook

The business model for Facebook is to harvest the data from your website and then push adverts to yourself and all visitors to your page. These adverts then follow you all through the web no matter where you visit. These adverts may also not really be perceived as appropriate to any viewer. As seen many times recently the data Facebook harvest is also open to attack and theft by hackers

When a person visits an organisation’s FB page they are asked to log-in or register with Facebook which will bring them into the Facebook family wither the person wants to or not.

 A standard Facebook page that looks like everyone else's Facebook page, it doesn't give a good idea of what your organisation is about, or make it easy to find information that one may be searching for.

You need to have a website that you control, contains content that you own (when you post it on Facebook they get the credit with the search engines, not you), and is specifically dedicated to helping you grow your online presence 

Every organisation needs its own website and it should do more than simply show the world that you exist. It supports the organisations’ values, showcases the organisations’ culture, and helps the group to reach their community. One has NO control on these social platforms. The Website is the “Hub” of Your Online Presence – social media is a Marketing Tool.