A while back, I saw a video done by Greenpeace protesting against Nestlé, maker of Kit Kat, because of their use of palm oil which brings serious consequences:

Nestlé, maker of Kit Kat, uses palm oil from companies that are trashing Indonesian rainforests, threatening the livelihoods of local people and pushing orang-utans towards extinction.

I spread the word about this on Twitter, and got very excited a couple of weeks later to read about Nestlé having decided to stop using products that harm the rainforest. Way to go Greenpeace!