CREDO Action is one of the many online petition sites that you'll see passed around facebook and e-mail. I signed at least one petition through them, and they began sending me regular e-mails, as most online petition sites do. (I'm also on the change.org and avaaz.org mailing lists.)
I do not like CREDO. For one, they are extremely liberally biased (and that's saying something for me, as a social liberal). I was disturbed they were collecting money to "fight against the tea party." There are so many social injustices in the world, why should they raise money to quell someone's freedom of speech?
For two, they use un-scientific rhetoric. I received several campaigns against "pink slime" from them. While it's true the meat product they're referring to is low quality and fatty, slinging slurs like "pink slime" in the face of scientific testing is in itself disgusting and disgraceful. A bad product will be obviously bad, without giving it ridiculous labels. I have seen the way the "toilet to tap" branding was used to destroy a perfectly valid scientific treatment of water. It is a distasteful way to run a campaign.
Finally, what made me jump onto site jabber and write this review, was when I received junk mail from CREDOmobile.com. It is obvious from the timing and the obvious CREDO association that they got my address when I signed the petition. I have am appalled that my address, given in confidence to validate my petition signature, is being used to sell me a product (mobile cell phone service). CREDO claims to be a political site, but now I see they're just a profit driven company. I wouldn't give them a penny of my money, and I warn everyone else from doing the same.