最好通过电子版和网络查找，Ctrl + F，尽量不要用肉眼去找，效率极低。
Netflix：80% 被观看的电影来自推荐
[1] Gomez-Uribe C A, Hunt N. The Netflix recommender system: Algorithms, business value, and innovation[J]. ACM Transactions on Management Information Systems (TMIS), 2015, 6(4): 13.
Amazon：亚马逊有30%的页面浏览量来自于个性化推荐系统
[2] Sharma A, Hofman J M, Watts D J. Estimating the causal impact of recommendation systems from observational data[C]//Proceedings of the Sixteenth ACM Conference on Economics and Computation. ACM, 2015: 453-470.
Google新闻：38%的点击量来自推荐
[3] Das A S, Datar M, Garg A, et al. Google news personalization: scalable online collaborative filtering[C]//Proceedings of the 16th international conference on World Wide Web. ACM, 2007: 271-280.
The click-through numbers that we report are from running our experiments over a large user fraction of the entire Google News traffic (millions of users) over a period of 5-6 months. We observe that, on an average, CVBiased and CSBiased are better by 38% as compared with the baseline Popular.
推荐系统-蒋凡 2.5.2小节
实验在实时数据上对比了新技术和一种非个性化的方法，这种方法将文章根据最近的热度排序。为了对比两种方法，推荐列表中间隔插入了两种算法的推荐物品。实验结论根据物品得到的用户点击数衡量，个性化方法明显占优势（大约38%），个性化 > Popular > 不使用推荐，推理，Google新闻有38%的点击量来自推荐。
https://zhuanlan.zhihu.com/p/30898729
[4] Smith B, Linden G. Two decades of recommender systems at Amazon. com[J]. Ieee internet computing, 2017, 21(3): 12-18.
Youtube的推荐占了总视频点击的60%。
https://blog.csdn.net/DASlab/article/details/48598095
[5] Davidson J, Liebald B, Liu J, et al. The YouTube video recommendation system[C]// Acm Conference on Recommender Systems. 2010.
Amazon：亚马逊20%~30%的销售来于推荐系统。-项亮《推荐系统实践》Page7
Amazon：亚马逊35%的收入来自其推荐引擎。
35% of Amazon.com’s revenue is generated by its recommendation engine.
http://rejoiner.com/resources/amazon-recommendations-secret-selling-online/
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