Palantir Technologies is a computer software company, primarily providing data analysis services, founded by Peter Thiel. While still a private company, its estimated worth is in the billions of dollars.
Yelp is an online review site for restaurants, cafes, and other local businesses and sites. It was founded by Jeremy Stoppelman (right) and Russel Simmons (not pictured.) Both of the founders are former PayPal employees.
Image: Kmeron for LeWeb13\/Flickr (Creative Commons)
Yammer
Yammer is a social enterprise software company that was founded by former PayPal executive David Sacks in 2008. The company was acquired by Microsoft for more than $1 billion in 2013.
Slide was a photo sharing tool for social media sites such as Myspace, and was acquired by Google in 2010. The company’s founder and CEO, Max Levchin, was an original founder of Confinity, which would later become PayPal.
CapLinked is a SaaS platform for online business collaboration and workflow optimization. CapLinked was founded by Eric Jackson, a former employee at PayPal and author of The PayPal Wars.
Geni is a social networking site based around genealogy discoveries. The company was also founded by David Sacks and was acquired by MyHeritage in 2012.