Marc Andreessen has joined eBay’s board of directors, effective immediately.

Andreessen is most noted for co-founding Opsware and Netscape, and served as AOL‘s CTO immediately following its acquisition of Netscape. His current venture is Ning, a new consumer Internet company founded in 2004 that is focused on building a next-gen platform for social networking. Rather than having its users join one all-encompassing social network, Ning encourages and allows users to create their own social networks for anything they’re passionate about. In four years, more than 480,000 social networks have been created by users on Ning.

“Marc is a true visionary whose experience will be invaluable to eBay,” said John Donahoe, president and chief executive officer of eBay Inc. “We look forward to learning from Marc’s insights and expertise as we drive further innovation on our platform, invest in growth opportunities and develop technology that will further benefit our customers, build powerful communities and enhance e-commerce.”

In addition to eBay, Andreessen currently serves on the boards of Facebook, Stanford Hospital in Palo Alto, CA and Room to Read in San Francisco, CA.

You can follow Andreessen’s blog at blog.pmarca.com. It’s currently on hold but due to get back up and running in the near future.

Cheers,
RBH