Check out which companies are making headlines after the bell Thursday:
Facebook - The social-media giant posted earnings of 12 cents a share, excluding one-time items, in line with expectations. The company reported revenue of $1.18 billion, topping estimates for $1.15 billion. But shares reversed their initial gains to turn sharply lowerin extended-hours trading, hitting an all-time low, amid ongoing worries over future growth. Facebook shares are down nearly 30 percent from its IPO price of $38 a share. (Click here for after-hours quote.)
Facebook's results com a day after social game services company Zynga posted quarterly results that missed estimatesand handed in 2012 guidance that disappointed investors. Other social networking companies including Groupon and LinkedIn also slid in extended-hours trading.
Amazon.com - The online retailer posted earnings of 1 cent a share and sales of $12.83 billion, missing expectations for 2 cents a share on revenue of $12.88 billion. In addition, the company handed in a weaker-than-expected current-quarter revenue guidance.Shares tumbled in extended-hours trading. (Click here for after-hours quote.)
Starbucks - The coffeehouse giant posted earnings of 43 cents a share, missing expectations for 45 cents a share. But revenue was in line at $3.33 billion. In addition, the company handed in for current-quarter and full-year 2013 earnings. Shares dropped sharply in extended-hours trading. (Click here for after-hours quote.)
Amgen - The biopharmaceutical company posted earnings of $1.83 on revenue of $4.48 billion, easily beating expectations for $1.54 a share on revenue of $4.08 billion. In addition, the company boosted its full-year outlook, sending shares higher in extended-hours trading. (Click here for after-hours quote.)
Expedia - The travel website posted earnings of 89 cents a share, ex-items, on revenue of $1.14 billion, beating estimates for 71 cents a share on revenue of $990 million. In addition, the company boosted its dividend to 13 cents a share. Shares surged in extended-hours trading. (Click here for after-hours quote.)
Coinstar - The owner of the Redbox movie-rental kiosks posted earnings of $1.11 a share on revenue of $532 million, missing estimates for $1.16 a share on sales of $545 million. Shares plunged in extended-hours trading. (Click here for after-hours quote.)
Gilead Sciences - The biotechnology company posted earnings of 99 cents a share, excluding one-time items, on revenue of $2.41 billion, topping estimates for 95 cents a share on revenue of $2.29 billion. Shares rallied in extended-hours trading. (Click here for after-hours quote.)
Valero Energy - The energy company increased its quarterly dividend by 16.7 percent to $0.175 from $0.15. (Click here for after-hours quote.)
—By CNBC’s JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)
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