By Benjamin Pimentel, MarketWatch

Twitter Inc. shares were in the red Friday after the social network got a sell rating from S&P Capital and options trading began on the New York Stock Exchange.

Twitter (TWTR) was recently trading down 2% to $43.78 as options trading began on the stock on the New York Stock Exchange. Volume is expected to be high and the trading could play into investor demand to short the stock.

Twitter on Friday was also given a sell rating and a price target of $30 by S&P Capital IQ.

In initiating coverage on the microblogging site's stock, S&P Capital analyst Scott Kessler said Twitter has "substantial revenue growth potential, given what we see as a notable multinational brand and user base, emerging monetization efforts, and strength in mobile." But he said the San Francisco-based social network "has been spending to support expansion, leading to considerable losses."

Twitter went public last week when Twitter shares opened at $45.10 after pricing at $26. The stock was on track to end its first full week of trading with a gain of more than 5%.

Other social media stocks were up. Facebook (FB) rose nearly 1%, while LinkedIn (LNKD) gained 5% and Yelp Inc.(YELP) was ahead by 4%.

The tech sector also got a lift from shares of Agilent Technologies (A), which were up more than 9% after the company reported better-than-expected profit.

On the downside, shares of Hewlett-Packard (HPQ) and Apple Inc. (AAPL) were each down a fraction.

The Nasdaq Composite Index (RIXF) was up 0.2% at 3,980. The Morgan Stanley High Tech 35 Index (MSH) and the Philadelphia Semiconductor Index (SOX) were each up a fraction.

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