Electric vehicle giant Tesla Inc TSLA is well-known for not spending much on advertising over the years, relying instead on strong word-of-mouth recommendations from its customers and fans.The company is holding a contest with its customers and fans for a video ad it could use in the future.What Happened: Tesla is launching a new contest called TeslaVision, asking fans to submit videos of what the EV company means to them. This move comes as demand and delivery figures for the company are falling."The Tesla ...