NEW YORK (TheStreet) -- TheStreet's Jim Cramer paused during a busy day at the NYSE to answer questions from his Twitter feed.

He told Debra Borchardt that he likes Yelp (YELP) - Get Report at current levels, but admitted it's one of the few stocks that could be under pressure from profit taking since it's up 214% in 2013.  So many investors have such massive gains that the downward price action is likely causing some to lock in profits, he said. 

In fact, that's what caused Cramer to sell the Facebook (FB) - Get Report position in the Action Alerts PLUS portfolio. He said Facebook stock was becoming "tepid" and his team didn't want to give up the big gains from buying this stock when it was in the $20s. 

Cramer says U.S. Airways (LCC) is a buy, as are DeltaAirLines (DAL) - Get Report, SpiritAirlines (SAVE) - Get Report and United Continental Holdings (UAL) - Get Report. He said the airline sector is one of his top picks to continue outperforming in 2014.

-- Written by Bret Kenwell in Petoskey, Mich.

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Bret Kenwell currently writes, blogs and also contributes to Robert Weinstein's Weekly Options Newsletter. Focuses on short-to-intermediate-term trading opportunities that can be exposed via options. He prefers to use debit trades on momentum setups and credit trades on support/resistance setups. He also focuses on building long-term wealth by searching for consistent, quality dividend paying companies and long-term growth companies. He considers himself the surfer, not the wave, in relation to the market and himself. He has no allegiance to either the bull side or the bear side.