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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Frequent spenders might want to wear tags in high-end malls that would trigger text messages and videos about sales as they walk the mall.

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These tags are similar in concept to the familiar HTML labels that help format text and other data on webpages.

BBC: NEWS | Technology | Yahoo makes semantic search shift