How Google's rocking ad revenue is keeping its troubles under wraps

The two best business models the internet has ever seen are still humming

In case you were worried, the advertising titans of the internet are doing just fine. 

Facebook Inc. showed that last week by reporting a 30 percent jump in fourth-quarter revenue from a year earlier. It was the lowest growth rate in the company’s short history, and the company has many challenges to keep growing, but it turns out that Facebook keeps making bank because its ads work and the company is willing to plaster them all over its internet hangouts. 

The same appears true for Google parent company Alphabet Inc. For the sixth consecutive quarter, the company’s advertising sales rose