NEW YORK -- Facebook founder Mark Zuckerberg rang the Nasdaq's opening bell from Menlo Park, Calif., heralding the start of Wall Street trading and the social networking juggernaut's public debut.
Facebook, which raised $16 billion in its initial public offering late Thursday, won't start trading on the stock market until 8 a.m. PDT.
The delay is intended to allow for orderly trading given the investor frenzy and media hype surrounding the historic IPO.
The technology-heavy Nasdaq index was lower in early trading, falling 2 points, or 0.1%, to 2,811.
The Dow Jones industrial average was essentially flat in early trading, hovering around 12,442 points.
The broader Standard & Poor's 500 index was up 1.3 points, or 0.1%, to 1,306.