https://www.cnbc.com/2019/01/17/elon-musk-tesla-to-end-customer-referral-program-on-feb-1.html

Tesla's customer referral program will come to an end on Feb. 1, chief executive Elon Musk said in a tweet Thursday.

The initiative lets drivers give their friends a referral code to get six months of free charging via Tesla's Supercharger network.