https://techcrunch.com/2019/01/17/tesla-referral-program-end-date/

At the end of the month, Tesla will end a long-running referral program that offered incentives for existing Tesla owners to help drive sales. In its recent iterations, the referral system gifted new buyers who found their way to a Tesla through a friend with six months of free charging at Supercharger stations.

Most recently, the referring friend would become eligible for a set of characteristically outlandish prizes, from launching a chosen photo into deep space orbit to a VIP invite to one of the company’s flashy unveiling events, depending on how many qualifying referrals were made. Tesla’s oft-chatty chief executive characteristically announced the news in a tweet.