By Alistair Barr
SAN FRANCISCO (Reuters) - Facebook Inc shares slid below $30 to a new low on Tuesday as nervous investors fled the company's shares, concerned about the social network's long-term growth prospects and an initial offering price that in retrospect may have been too rich.
Shares of Facebook fell nearly 9 percent to $29.05 in midafternoon trade, an all-time low. The eight-year-old company, which began life in Mark Zuckerberg's dorm room, has now shed more than $20 billion in value since its controversial and glitch-ridden market debut at $38 on May 18.
A software error on Nasdaq OMX Group Inc's U.S. exchange delayed the start of trade by 30 minutes on Facebook's first day of trading, which was to have been the culmination of breakneck growth for the cultural and Internet phenomenon.
Instead, claims of selective disclosure in the days leading up to the IPO about Facebook's slowing revenue growth engulfed the company in controversy, as did perceptions among some investors that the stock had been overpriced coming out the gate.
Wall Street has long harbored concerns that Facebook, while boasting nearly a billion users worldwide and dominating Internet social-networking, would have difficulty translating its growing presence on smartphones and other mobile devices into revenue. Rivals Google Inc and Apple Inc now control the mobile arena.
Facebook options began trading on Tuesday, presenting a tempting target as more investors bet the underlying stock would head south. They piled into put options -- granting investors the right to sell stock at a certain price -- marking one of the busiest debuts ever in the options market.
Vague talk about Facebook's next moves may also be giving some pause. Rumors that the company may be considering acquiring Opera Software pushed Opera's Oslo-listed shares up more than 26 percent on Tuesday.
Analysts say the mobile-phone software maker could prove a crucial component in Facebook's still-patchy strategy to earn revenue from smartphones, but it could carry a price tag of as high as $1 billion.
(Reporting By Edwin Chan and Alistair Barr; Editing by Matthew Lewis and Steve Orlofsky)