Launched in 2017 by the Ethereum team, Rinkeby Faucet allows anyone to claim free Ether on Rinkeby Testnet. The faucet was developed for educational and testing purposes, enabling easy network onboarding and smart contract testing. Users can request Ether by making a Twitter or Facebook post with their Ethereum address and pasting the post URL into the faucet. Requests are tied to social media accounts to prevent malicious actors from accumulating too much Ether. Users can request 3 to 18.75 Ethers for a period from 8 hours to 3 days.