It looks like Non-Profits are beginning to embrace Social Networking.  The Port has conducted a recent survey of Non-Profits.  Their findings:

Social networking has become an integral part of nonprofits’ online strategy, according to a survey recently conducted by NTEN, Common Knowledge, and ThePort. In this online survey conducted in March, 2009, 929 respondents representing nonprofits of all sizes and from multiple vertical seg- ments indicate that nearly three-quarters (74.2%) have a presence on Facebook, and 30.9% have one or more social networking communities on their own web site.

For more info, you can download the report (you'll need to provide contact info first).