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An obvious example is interference in the 2016 U.S. election. The leaders of Western democracies and social media companies were, like the rest of us, slow to understand how social media could be harnessed for malicious, manipulative purposes. Many of us looked at social media and saw ways to share cat memes and food pictures. Others saw the most advanced and efficient means ever devised to distribute propaganda and misinformation.

Among urban people, WeChat has become a saturated avenue for socializing and marketing. The satisfaction score has dropped to 80.6 from 83.5 a year ago, against 100 that indicates "fully positive".

Amtrak's co-chief executive, Richard Anderson, acknowledged that a working Positive Train Control (PTC) system, which slows trains if they are going too fast, had not been installed on that stretch.

An exterior view of the new passenger transport center in Wuhan. [Photo/Xinhua]

An estimated 400,000 girls and women were forced into prostitution by the Japanese military during World War II. Half of them were from China, 140,000 to 160,000 from Korea, and the rest were from Japan and other Asian countries, according to Chinese historian Su Zhiliang.