Here are some of the nonprofits and social enterprises creating incredible communities online:
-DonorsChoose.org - They've done a great job of creating an online community around transparency and sharing. The key for a social enterprise creating a great online community comes down to effective storytelling and transparency.
-UN Foundation’s Global Good Challenge - The United Nations Foundation’s Global Good Challenge is a worldwide crowdsourcing campaign to encourage global citizens to donate their voice to specific causes like child marriage.
-FITE celebrates its donors - FITE creates community by incorporating social media into the donation process.
SOURCE LINK to full article:http://thenextweb.com/entrepreneur/2012/12/08/9-nonprofits-and-social-enterprises-creating-incredible-communities-online/