Facebook IPO Spawns New Wave Social-Media Angel Investors

Zef Nikolla/Facebook via Bloomberg

Mark Zuckerberg, chief executive officer of Facebook Inc., center, Sheryl Sandberg, chief operating officer of Facebook, center left, and Robert Greifeld, chief executive officer of Nasdaq OMX Group Inc., center right, applaud after remotely ring the opening bell for trading at the Nasdaq MarketSite from the Facebook campus in Menlo Park, California.