Authorship are reserving 1million free tokens for holders of existing ethereum addresses. Their ICO investment is in Ethereum and ATS will be an Ether token. I'm guessing they want to attract the right crowd (people with ETH adddreses !) myetherwallet accepts ERC20 tokens like ATS
Get free tokens 75 ATS TOKENS for a simple email signup !
http://bounty.authorship.com/ref/r8130774