Tesla's referral program is the closest it comes to an advertisement campaign at present. Current owners receive benefits for referring new buyers, who also get something out of the deal. Tesla's just updated its program, and it's switched around the structure a bit.
If a Tesla owner refers a friend to purchase a and take delivery by April 15, that friend will get $1,200 off the installation of a home charger. Current owners will receive a maximum of three referral codes.
So what's in it for the owner, then? All owners with redeemed referral codes will be entered in a draw. The grand prize is an all-expenses-paid trip for four to the headquarters of Tesla's sister company SpaceX in Los Angeles. Winners also get a free (not counting taxes and the like) with enabled. Five other winners will also win a trip, but they don't get the car.
There are a few bits of small print attached. For example, Ohio residents are not eligible, and Model S orders must be received by April 15. Tesla's website also warns owners against playing dirty: "Please note that we may withhold awards where we believe customers are acting in bad faith or otherwise acting contrary to the intent of this program. To be clear, commercializing or otherwise selling referral codes is not appropriate, and we will not honor such codes," the referral site states.