Get $10 free. It's not even a scam.

If you sign up to the following airdrops you will get $10 worth of ether tokens. 

1. Wcex – it's a digital currency exchange, and gives away 50 tokens worth 10 cents each to new members (you need to sign up with an email address)
2. Woter – it's another digital currency exchange, and gives away 20 tokens totalling $5 in value. 

Good luck, and enjoy the free tokens.