Shares of Facebook, which went public in a rocky initial public offering in May, were down 6.1 percent at $25.20 in after-hours trading on Thursday.
Facebook posted a net loss of $157 million, or 8 cents a share in the second quarter, due to hefty stock compensation charges related to its IPO, compared to net income of $240 million, or 11 cents, in the year-ago quarter.
Facebook Q2 revenue increases 32 percent
Excluding the charges, Facebook said it earned 12 cents a share.
In its first report to Wall Street since the IPO, the world's No.1 social networking company said that revenue in the three months ended June 30 was $1.18 billion, compared to $895 million in the year-ago quarter.
Facebook said it had 955 million monthly active users, up from the 901 million users at the end of March.
The eight-year-old company, started by Mark Zuckerberg in his Harvard dormitory room, became the first American company to debut at over $100 billion in value when it went public on May 18. But shares of Facebook are down nearly 30 percent from its $38 offering price, as investors worry about the company's ability to transform its growing mobile presence into ad revenue and the company's long-term money-making potential.