Bittube airdrops 5 TUBE tokens (~TBA) to their airdrop participants for the following simple tasks. They also offer a referral program where you can earn additional TUBE for each user you refer.
Step by step guide
Install the BitTube Browser Extension
Register and validate your email address.
Verify your phone number
Hint: You will receive your Tube tokens within a 24 hours delay.
You can refer now additional users and get 5 tokens for each user. You can see your Referral link in Account - Share my referral link. If you see a wrong link, you have to logout and login once again.
You will earn additional tokens while you are surfing with the activated browser extension.