The 51 Airdrop Presale is a trending opportunity. It appears to be related to other airdrop projects like AIR presale and Airdrops fairlaunch. Details are limited, but related projects offer weekly airdrops, deflationary tokenomics, multi-sig wallets, and locked liquidity. Some projects feature 2% reflections and buybacks, as well as promotional airdrops for token holders. Eligibility may require holding specific amounts of USDT in related tokens.