Your organization does not have a website.
You have never heard of twitter.
Facebook is something that young people do as far as you are concerned.
YouTube, sounds like something you would use to clean a clogged drain.
Your organization may not have an established web presences but your supporters, staff, volunteers and community are all chatting about you online. Yes you create and manage your website, twitter account etc. But you can not manage what people will say about you and if you don’t have an established web presence then you have no way of knowing what is being said about your organization.
Does the playground need repairs? Is there an empty plot that could be turned into a community garden? Your community, volunteers and future donors are all talking about your organization.
Your presence online not only gives you insight into what being is said about your organization but also gives you an opportunity communicate with those who care about your organization.