https://pay.reddit.com/r/DarkNetMarkets/comments/27s0iv/shared_coin_broken_xpostrbitcoin/
was posted here regarding the discovery that blockchains sharedcoin is not anonymous, and links to a user who posted similar findings 6 months ago:
http://www.reddit.com/r/Bitcoin/comments/1reces/i_just_figured_out_a_super_easy_method_to_find/
The principles behind coinjoin are sound however Blockchain.info's (a UK company) implementation of it is not nor has ever been anonymous and is trivial to trace. A warning needs to be placed next to the sharedcoin link so that users do not mistakenly use it.
SharedCoin will be removed from the sidebar until further notice.