Facebook, the popular social networking site, has raised $500 million from Goldman Sachs and a Russian investor in a deal that values the company at $50 billion, according to people involved in the transaction. The deal makes Facebook now worth more than companies like eBay, Yahoo and Time Warner. The stake by Goldman Sachs, considered one of Wall Street’s savviest investors, signals the increasing might of Facebook, which has already been bearing down on giants like Google. The new money will give Facebook more firepower to steal away valuable employees, develop new products and possibly pursue acquisitions — all without being a publicly traded company. The investment may also allow earlier shareholders, including Facebook employees, to cash out at least some of their stakes. – read more from Dealbook