Keybase is ending a program that distributed units of the Stellar cryptocurrency dubbed lumens – to its users due to an influx of spammers and fraudulent accounts. The program was intended to get people interested and familiar with the technology. Stellar is a cryptocurrency that uses validator nodes and a consensus protocol rather than the proof-of-work model that Bitcoin uses. The Stellar Development Foundation was co-founded by Jed McCaleb, one of the original founders of Ripple as well as Mt. Gox.”]
Source: https://www.cuinfosecurity.com/keybase-nixes-stellar-airdrop-after-spam-fake-accounts-a-13500