These text tags, known as markup, tags, or, more properly, elements, conform to a predefined structure.

这些文本标记，又称标记、标签、或更恰当的说是元素，符合预先定义的结构。

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That means that automatic ad targeting isn't limited to the relatively small amount of video content generated by media companies and savvy bloggers who carefully label all of their content with text tags, he says.

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"Video search is difficult, " he says, explaining that most video search looks for descriptive text in tags attached to the video, which can be incomplete or misleading.

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The app then tags photos, video and text with the appropriate locations.

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