My pick for this year P4A is WhyHunger, the org I've worked at and supported the past 2.5 years. :]
WhyHunger is a grassroots support organization working to build and support resilient, powerful and unifed networks of grassroots leaders and communities working at the intersection of the root causes of hunger and poverty to build and strengthen social movements worldwide. WhyHunger envisions that these movements will transform food systems into ones that are socially and economically just, nourish whole communities, and ensure the rights of all people to food, land, water and sustainable livelihoods.
Go here to learn more: http://whyhunger.org/our-work/how-we-work
Learn about Hungerthon & donate here: https://hungerthon.org/
Project for Awesome is when this wonderful community gets together and advocates for charities that decrease the overall level of world suck. As a community, we promote these videos and raise money for the charities.
Go here to learn more about P4A: http://projectforawesome.com/
& donate! http://projectforawesome.com/donate