If you have not heard of Social Actions you should check them out. They are a group of innovative leaders in online social change, focused on pushing the edge of what can be done online and creating new opportunities to help nonprofits succeed.
One project they have going is a widget that promotes “social actions” for nonprofits. You can connect it to your site through sample html code or a plug-in you can find on their site. There are a number of websites and organizations on the internet looking to become the hub for volunteering or community action and it would take a full-time job just to keep track of them. This widget aggregates these sites into one place. No more searching the internet to find projects to promote or to get you message out there.
http://socialactions.com/actionapps – This link has general information about what applications connect to the Social Actions API.
http://bit.ly/actionappdirectory Here is a directory of apps including the “Social Actions Embeddable Widget” that I described above.
There are 70 online platforms participating in the Social Actions API have profile pages at http://socialactions.com/actionsources. You can also check them out individually.