Details: Many of the accounts posted messages that matched, word for word, others that Twitter had deleted, or posted messages at exactly 12 and 42 minutes past the hour, indicating an automated effort.

Perspective: While social media has made it easier to build mass movements, like the one in Hong Kong, it has made it harder to translate the sentiment into real change, argues our columnist Thomas Friedman. “These modern movements are crowdsourced but also crowd-enforced,” he writes, “and that’s intimidating for anyone who wants to make a deal.”

Fed cuts interest rates again

The U.S. Federal Reserve cut rates by a quarter percentage point, the second time since late July, and suggested it was prepared to do more if the economy showed continued signs of weakness.

But the rate cut did little to appease President Trump, who has been pushing the central bank to take a bigger step and cut rates to zero, or even into negative territory.

A growing number of officials expect one more reduction in the coming months, based on economic projections released on Wednesday.

Another angle: Oil shocks, autoworkers on strike, political pressure on the Fed — at first glance, this economic era seems similar to one in the 1970s. But there are a few big differences that are crucial to understanding the world economy in 2019.