Many sites offer some statistics like "The hottest topics in the last 24h". For example, Topix.com shows this in its section "News Trends". There, you can see the topics which have the fastest growing number of mentions.Many sites offer some statistics like "The hott
阅读背景：
计算趋势主题或标签的最佳方法是什么？
来源：互联网
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