Which companies have the Paypal Mafia founded?

Context: The "PayPal Mafia" is a group of former PayPal employees and founders who have since founded and/or developed additional technology companies such as Tesla, Inc., LinkedIn, Palantir Technologies, SpaceX, Affirm, Slide, Kiva, YouTube, Yelp, and Yammer. Most of the members attended Stanford University or University of Illinois Urbana–Champaign at some point in their studies.

Answer: Tesla, Inc., LinkedIn, Palantir Technologies, SpaceX, Affirm, Slide, Kiva, YouTube, Yelp, and Yammer