MicroBitcoin is a decentralized peer-to-peer(P2P) payment protocol for the micro-economy. MicroBitcoin platform is hard forked from Bitcoin’s 525,000 block, and is intended to be a user-friendly cryptocurrency.
Micro Bitcoin airdrops 3.000 MBC token (~$0,02) to their airdrop participants for the following simple tasks. They also offer a referral program where you can earn additional MBC. Micro Bitcoin is listed on Coingecko.