Firstly, be careful when participating in airdrops, as there are many scams out there. Before participating, you should research the project and its team, read the whitepaper, and check the community's reviews and feedback.

Secondly, it's important to note that airdrops are typically done through social media platforms like Twitter or Telegram. If you plan to use adBTC credits to promote airdrops, you may need to find alternative platforms that support promotion.

Finally, you should be cautious of any airdrop that requires you to refer others in order to receive payment. This could be a sign of a pyramid scheme or a scam.

In summary, be careful when participating in airdrops and do your research before investing your time and resources.