http://www.impatientoptimists.org/Posts/2012/01/Do-You-Have-a-WorldChanging-Idea?WT.mc_id=1_11_2012_studentannualletter_fb&WT.tsrc=Facebook
Or any other demographic whose primary defining characteristic is their age group, really.
http://www.impatientoptimists.org/Posts/2012/01/Do-You-Have-a-WorldChanging-Idea?WT.mc_id=1_11_2012_studentannualletter_fb&WT.tsrc=Facebook