Marc Andreessen is known as an entrepreneur, investor, startup coach, blogger, and a multi-millionaire software engineer best known as co-author of Mosaic, the first widely-used web browser, and founder of Netscape Communications Corporation. He was the chair of Opsware, a software company he founded originally as Loudcloud, when it was acquired by Hewlett-Packard. He is also a co-founder of Ning, a company which provides a platform for social-networking websites. As of June 30, 2008, he is said to be joining the Board of Directors of Facebook. On September 30, 2008, it was announced that he had joined the Board of Directors of eBay. Andreessen is a frequent keynote speaker and guest at Silicon Valley conferences.