NEW YORK (

TheStreet

) --

Facebook

(FB) - Get Report

was a big loser in premarket trading on Friday following the social networker's first

quarterly results

as a public company.

Facebook met analysts' top- and bottom-line estimates, although decelerating revenue growth and lack of guidance weighed heavily on the stock before market open. Shares of the Menlo Park, Calif.-based firm plunged 13.24% to $23.29 as investors digested the

second-quarter

numbers.

Despite rumors that he would be a no-show, Facebook CEO Mark Zuckerberg was present throughout the company's conference call. Facebook's top priority, he explained, is a sustained focus on mobile, platform and social ads. "We have a lot of interesting things going on here," he said.

Facebook was also the most active premarket

Nasdaq

stocks on share volume of 3,036,856.

Key Facebook partner

Zynga

(ZNGA) - Get Report

was another laggard, slipping 2.68% to $3.09. Shares of the social gamer plunged 37.48% on Thursday following its own

second-quarter results

earlier this week.

AuthenTec

( AUTH) was a major gainer, climbing 60.75% to $8.15 after the company confirmed a merger with

Apple

(AAPL) - Get Report

. The iPhone maker is acquiring the fingerprint sensor specialist for $8 a share, according to documents filed with the

Securities and Exchange Commission

.

Reuters

reported the deal values AuthenTec at about $356 million.

Apple

(AAPL) - Get Report

shares dipped 0.05% to $574.6 on Friday.

Amazon

(AMZN) - Get Report

crept up 1.13% to $222.5 after posting mixed

second-quarter results

after market close on Thursday.

--Written by James Rogers in New York.

Follow @jamesjrogers

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