After Zuckerberg and his partner Eduardo Saverin saw that there had already been 4000 registered users, they realized that they needed the services of new programmers. One of them was Mark’s neighbor, Darren Moskowitz, who in March 2004 further opened the Facebook service to students at Columbia University, Stanford, and Yale. Then in August 2004, Mark received the first investment from one of the founders of PayPal, Peter Thiel, who invested $500,000 dollars. This amount was sufficient for what Facebook needed at that time ,and in less than a year after that, more than 1 million people joined the social network.