What's awesome about Instagram is, like twitter, users can attach hash tags to their photos and automatically have them categorized instantly. That means that anyone who knows the non-profit's hashtag can help to raise awareness. It is really an interactive medium because anyone with a mobile device can become an activist for your organization! And with today's mobile generations, I think this would be an excellent digital tool for the non-profits of today (and tomorrow!) to consider adding to their repertoire!
You can view some examples of how non-profits are promoting their causes by checking out this article on Instagram's blog:
http://blog.instagram.com/post/8758032746/nonprofits-on-instagram
A picture of a seal raises awareness for Galapagos ocean pollution.