"PayPal Mafia" is a term used to indicate a group of former PayPal employees and founders who have since founded and developed additional technology companies such as Tesla Motors, LinkedIn, Palantir Technologies, SpaceX, YouTube, Yelp, and Yammer. Most of the members attended Stanford University or University of Illinois at Urbana–Champaign at some point in their studies. Three members, Peter Thiel, Elon Musk, and Reid Hoffman, have become billionaires.