Amazon reported 4th quarter earnings Thursday after market close. Here are the key things you need to know.

1. Advertising is growing, but two caveats
Advertising remains one of the fastest-growing parts of the Amazon business. The company reported that ad revenue (which it continues to classify as “Other” revenue line) is now up to $3.4 billion, up from $2.5 billion the prior quarter. That means a 95 percent year-over-year growth.

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