You might want to focus 'only' on Etherdelta exchange as of now in order to buy/sell PPT. URGENT MESSAGE: The slack bot is currently hacked. If you receive an email with a link to your wallet, in order to claim or receive Ether due to a new ICO bounty campaign, please abstain yourself to follow the link to your ether wallet, otherwise you might well lose your money, since you would actually make your ether wallet keys available to the hackers if you login to these fake sites.