Blockchain.info: Negative balance

[GIANNAT]

How the heck does this address have a negative balance?
I see that it starts with 3 so it has support for multisign etc but what's going on?
https://blockchain.info/address/3M1S3tZVkEJw7zVBtn1Mq8McVyfnNMAuoX

[dddd]

I would guess that it's just a blockchain.info bug.
See: http://btc.blockr.io/address/info/3M1S3tZVkEJw7zVBtn1Mq8McVyfnNMAuoX or https://www.biteasy.com/blockchain/addresses/3M1S3tZVkEJw7zVBtn1Mq8McVyfnNMAuoX

[GIANNAT]

Yep, I see. It looks like it is possible to "fake" transaction. This is a huge problem expecially for those people that rely heavily on blockchain.info

EDIT: more info found here
https://pay.reddit.com/r/Bitcoin/comments/2e1tx0/while_youre_busy_pumping_his_book_andreas/

[gmaxwell]

https://archive.today/VZbyc

[BTCjust]

https://archive.today/VZbyc

Total Received   3,226.02630512 BTC