>"Elon Musk's reply to Twitter user's post showing a picture of his old visiting card from 1995 has created a buzz. | >Tech billionaire Elon Musk heads different companies. From automotive and energy company Tesla to American aerospace company SpaceX to neurotechnology company Neuralink Corporation, he acts as the CEO for various organisations. However, do you know about the first company he ever started? It was Zip2 - a company that generated online city guides for newspapers. A recent post by a Twitter user reminded people of the company again and the post went viral after it received a reply from Musk himself.