Volume remained low Friday, as a major snowstorm in the Northeast kept traders away at the end of the holiday-shortened week.
Though the broader market's moves were relatively muted, Twitter ( shares continued to surge. The social media company's stock was up more than 2%, following a 6% jump on Thursday. )
With the significant run-up, some traders on StockTwits wondered if Twitter shares may be due for a pullback soon.
While Twitter was soaring, tech giant Apple (Fortune 500) continued to lose ground for a second day. Some traders speculated that activist investor Carl Icahn, who took a position in the company last year and has been pushing for a big buyback, may be unloading some shares. ,
StockTwits user StrayTrader said it certainly smells like a large institutional investors is selling shares of Apple, but even if that's the case, he stressed that "there are plenty of us who believe in it."
Shares of T-Mobile ( were sharply lower after rival ) AT&T (Fortune 500) said it would , offer up to $450 to customers who switch from T-Mobile.
Car makers were also in focus as they announced sales figures for December.
Chrysler reported strong sales for December, and a full-year sales increase of 9%.
Sales have been strong across the auto industry in 2013, with automakers selling more than 15 million vehicles in the U.S. -- their best year since 2007.
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