I think it's a great idea as well. I would only suggest that instead of asking what makes them different from others that maybe you ask what makes their organization unique. This gets away from it being a comparison type question and more into just highlighting the special attributes of their organization. You might also ask them what they have in the way of news updates that people could plug into, i.e. do they have a newsletter or blog. (Besides maybe if they don't have one, you could always offer your services to them or you could volunteer your services if it was a cause you were really passionate about.)

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Kimberly
Facebook Marketing Magic!