The Open Philanthropy Project recommended a GiveWell grant of $153,750 to One for the World via the Life You Can Save for general support. One for the World does outreach to university students encouraging them to pledge a percentage of their incomes to effective charities. This grant was recommended by GiveWell staff as part of an effort to increase money moved to GiveWell top charities.
See GiveWell’s page on this grant for more details.