Chris Hughes, co-founder of Facebook, has launched Jumo, which he describes as a social network for social activism.
The idea behind Jumo - which means "to come together" in the West African language of Yoruba - is to help people discover causes that matter to them and to their friends and, over time, deepen their ties to those causes, he told the LA Times.
Hughes has raised $3.5 million from the Omidyar Network, the John S and James L Knight Foundation, and the Ford Foundation as well as individuals to fund Jumo, which is a non-profit organisation.
Chris Bishko, director of investments at Omidyar Network, said Hughes could help non-profits "unlock massive potential."
Hughes was a key player in the evolution of online social networks. He helped Zuckerberg start Facebook in their Harvard dorm room.
In 2007, Hughes turned those skills to building the online brand and community of a young US senator, Barack Obama, helping to take him to the White House.
Hughes believes he can take that same idea of a network of volunteers that became such a potent political force and apply it to the issues that trouble the world.
He also expects that he can drum up the same kind of enthusiasm for saving the environment, ending child trafficking and fighting AIDS.