By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Mixed investor sentiment toward Facebook Inc. following its third-quarter results and comments from its chief financial officer took the spotlight in tech-sector trading on Thursday.

Facebook (FB) slipped by 2%, to $47.98 a share, which was in contrast to the immediate upbeat reaction to the company's results late Wednesday. While Facebook reported strong quarterly results, many investors keyed in on comments made by Chief Financial Officer David Ebersman regarding a decrease in daily users among younger teenagers, and that the company doesn't expect to significantly increase "the quality and relevance" of its Newsfeed ads in the fourth quarter.

Carlos Kirjner, of Bernstein Research, said that Ebersman's comments hint that Facebook my have to soon raise prices on its ads.

"With user growth decelerating, Newsfeed ad load steady, and multiple data-points suggesting that engagement in developed markets is not growing significantly, revenue growth has to come increasingly from rising price-per-ad," Kirjner said.

BMO Capital Markets analyst Daniel Solomon cut his rating on Facebook's stock to market perform, or neutral, from outperform, mostly due to what he called "the lack of visibility around Facebook's opportunity in Social TV advertising."

Another notable decliner was networking equipment maker JDSU (JDSUD), which was down almost 10%, at $13.38 after a short-sale restriction was lifted on the stock. Late Wednesday, JDSU gave a fiscal second-quarter revenue forecast that fell short of Wall Street analysts estimates.

Losses also came from Apple Inc. (AAPL), Angie's List Inc. (ANGI), Pandora Media Inc. (P) and Google Inc. (GOOG).

The Nasdaq Composite Index fell 12 points to 3,917, while the Philadelphia Semiconductor Index (SOX) managed to edge into positive territory.

Advancers included Yahoo Inc. (YHOO), Netflix Inc. (NFLX) and Hewlett-Packard Co. (HPQ).

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