The following are recommended activist websites I've found useful in one way or another. I encourage as many people as possible to visit and support.
http://www.worldrevolution.org
http://www.ashoka.org
http://www.msf.org
http://www.ifrc.org
http://www.earthfundintl.com
http://www.afribike.org
http://www.hajdeda.org.yu
http://www.ngltf.org
http://www.yaids.org
http://www.freerice.com
More information on these later...