Facebook shares ended their first day of trading at $38.23, barely above the company's initial pricing of $38.
Shares in the social network rose more than 10% to $42 within minutes of trade beginning, before quickly falling back.
Later gains were wiped out too at the end of a volatile day's trade, as the firm's debut on the Nasdaq exchange was also delayed by a technical glitch.
Mark Zuckerberg, 28, who started Facebook while at university, remotely opened trading on the Nasdaq earlier.
He appeared via a video link from a celebration at the firm's headquarters in California.
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