Social media allows people to create and disseminate their messages in their own way and on their own terms.
The web today can offer enormous possibility for supporting citizen-led action on social and environmental issues.
Happy New Year! It's going to be a busy one for our Finalists as each group gets stuck in to delivering their projects.
The Big Green Challenge is ot just about the groups and approaches that go on to win - it's as much about bringing people and their ideas together to showcase what is possible.
According to a poll carried out by NESTA, as many as 17 million people in Britain would be willing to work with others to combat global warming.
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