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Open the airdrop form and follow the steps:
Join Telegram 
Follow on Twitter, liked and retweet top tweet
Like their Facebook page, like and shared top post
Post proof of ownership (below) on this BitcoinTalk Thread
#Proof of ownership :
@username
- facebook.com/username
- twitter.com/username
Lottery with 1,000 winners - 10 BCS (worth 0.1 ETH) each
Only 400 participants so far (counting the bitcointalk comments). Quite a good chance to win.
https://docs.google.com/forms/d/e/1FAIpQLSfdhGhat077WPeYa-6NzWriE9XtnKBGJr0dQWmQmUROJTKd-A/viewform