It was a very good week for two of the biggest tech companies on Earth. Facebook announced it made $9.3 billion this quarter, a 45 percent increase compared with last year, while Google’s parent company, Alphabet, posted earnings of $26 billion in the same time period, a 21-percent jump from a year ago. The vast majority of all this revenue came from advertising—87 percent for Google, and a whopping 98 percent for Facebook.

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