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Facebook is on pace for its worst day as a public company after opening trading down 19.6 percent on a second-quarter revenue miss and disappointing daily active user count.
The shares fell as low as $174.48 Thursday morning. Facebook closed at Wednesday at $217.50. You can follow the tick-by-tick changes on CNBC.
Thursday's plunge knocked roughly $120 billion in market value off the tech stock and is dragging the rest of the sector lower. Before Thursday, Facebook's largest single-day loss came in July 2012 when it shed 11 percent.