If there is a referral system, then you can think about inviting your friends and get a nice bonus for them.

The referral system is a great way to get coins. I often participate in bounty projects or referral programs.

Direct motivation to bring your friends and get nice bonuses for them, you just have to wait

I have not heard of this project have got an airdrop. However, it would be just awesome idea. I would like to join it

I learned about this project through friends, called to follow him and possibly take part in the bounty

My friends also advised me to take join this project and I can see it is really productive