GMail/Facebook 使用什么算法来投放与上下文相关的广告？
GMail 在电子邮件文本右侧的栏中提供了一些非常好的广告。 Facebook 也是如此。我在 Facebook 上看到的广告通常与我感兴趣的内容（非常）相关。显然，他们对可用的信息进行了预处理。 GMail 扫描我的电子邮件文本，提取关键字，然后投放相关广告。 Facebook 也是如此。他们有很多可用的用户特定信息。所以我想他们会在生成任何广告推荐之前对所有这些进行预处理。
有谁知道这些系统使用什么具体算法？
GMail serves some really good ads on the column on the right of the email text. Same goes for Facebook. The ads which I see on Facebook are often (very) relevant to what interests me. Obviously they preprocess the information available to them. GMail scans the text of my email, extracts keywords and then serves relevant ads. The same goes for Facebook. They have a lot of user specific information available to them. So I would imagine they preprocess all of it, before generating any ad recommendations.
Does anyone know of what specific algorithms do those systems use?
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至少 Facebook 似乎没有进行任何上下文分析。相反，当您购买广告时，您可以根据位置、年龄、页面来选择哪些人会看到该广告……Facebook 会尝试向所有这些人展示您的广告（特定人的广告根据其关注度进行排序）广告商希望付费展示，并且只展示前几个广告）。
尝试制作广告，这非常有趣（而且在他们询问你之前你可以走得很远）您的信用卡号码）。
Facebook, at least, doesn't seem to do any context analysis. Instead, when you buy an ad, you select who will see it based on their location, age, pages... and Facebook will try to show your ad to all those people (ads for a given person are sorted based on how much the advertiser wishes to pay to display it, and only the first few ads are shown).
Try creating an ad, it's extremely interesting (and you can get pretty far before they ask you for your credit card number).