By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Google, Facebook and Twitter led technology stocks lower on Tuesday, joining a broader market retreat, while shares of Groupon Inc. cling to a small gain after rallying earlier in the session on a B. Riley upgrade.

B. Riley raised Groupon's (GRPN)rating to buy from neutral, citing potential gains from the online daily deals site's recent initiatives, including a bigger marketing push.

Twitter Inc. (TWTR) fell 6% in early trades, while Google (GOOGL) and Facebook (FB) were each down more than 2%.

The Nasdaq Composite Index (RIXF) shed 1.3% to 4,394, as the Dow Jones Industrial Average (DJI) shed more than 100 points.

The tech sector also was weighed down by losses in shares of Hewlett-Packard (HPQ) and Apple Inc.(AAPL), each down nearly 1%.

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