Marc Andreessen, best known for co-founding Netscape and serving as the chairman of social network builder Ning, has announced that he is creating a new venture fund. Andreessen has a history of investments, having backed Facebook, Digg, Twitter, and others. Since 2007, he has also been involved in an angel fund with former Opsware executive Ben Horowitz. The firm will be called Andreessen Horowitz (their previous fund was called Horowitz Andreessen Angel Fund I). On the Charlie Rose show, Andreessen said that his fund will "preserve and extend" the angel model and that investments will range from $200,000 to $1 million, with $500,000 as the "typical size."