Presearch airdrops 25 PRE tokens (~$0,45) to their airdrop participants for the following simple tasks. They also offer a referral programm where you can earn additional PRE for each user you refer. Presearch is listed on CoinMarketCap and is ranked on #337, based on their current market capitalisation.
(You become eligible for your 25 token bonus, per referral, once each referral has earned 100 search reward tokens, and has been active 60 days after their initial sign up.)
1000 PRE needed to withdraw.