LinkedIn is not merely a site to host your online resume. It has become a major business-oriented social network for professionals and organizations.
LinkedIn can be a valuable and effective tool for sales and marketing teams. With over 300 million members (at the time of this article) and a lot of activity from c-level professionals and decision-makers, it's a vibrant community for business.
It can also be a great tool for those who work in development at nonprofits. The Vice President of Philanthropy, or similar such title, is the nonprofit counterpart of a Business Development Director at a for-profit company.
If sales folks can use LinkedIn to find prospects, warm leads, recruit and get referrals, then many of the same principles should apply to the nonprofit world.
Growing membership, finding sponsors and new donors, connecting with existing donors, getting referrals--all of these activities are well suited to this particular social network.