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I just learned about this site, tonight, via a Russel Brand interview. I don't have the time to study it a lot, but it seems like a credible contribution to activists' empowerment.
For one thing, it allows for more than just petitions, which are easy to ignore by US politicians. To some extent or other (I'm hardly knowledgeable about British politics), petitions probably don't carry a lot of weight in the UK, either.