Yahoo's latest acquisition will bring image-recognition technology to its Flickr service for sharing photos.
The Internet company is getting the new tools and expertise through its purchase of a startup called LookFlow.
Financial terms of the deal announced yesterday weren't disclosed.
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The one exception was the Internet blogging service Tumblr, which cost Yahoo Inc. $1.1 billion earlier this year.
Yahoo is picking up five LookFlow engineers in its latest deal.
Mayer, a former Google Inc. Executive, has been particularly interesting in snapping up startups with expertise in making applications for smartphones and tablets.