Silk road is like Amazon. It is a platform where individual sellers can offer products across a broad variety of categories. They are left feedback based on the success of the transaction. It is not a classified's listing like craigslist or kijiji, which are only service providers and can not be held legally responsible for the content posted on their sites (i.e. hitman offering to kill someone on craigslist).Amazon can be held liable if someone were to offer up a hitman contract. They are not just a service provider, they are an actual market which monitors sellers and take a fee for transactions completed. The same as SR.