I've used ton's of different sources to discover airdrops (telegram, twitter, etc.). One of the sites I use is Airdrop-Review because they rate the airdrops. It makes it easy to weed out the shitty ones.
The review/listing site recently launched a referral program where you can sign up and get tokens for referring people to their site. Do you think this is legit?
Here is the link to the program overview video;
http://airdrop-review.com/affiliate-program-overview/