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In its early days Pinterest was described as a “social scrapbooking” or photo sharing site. CEO Ben Silbermann has called it a “catalog of ideas.” But the company has generally shunned the “social network” label. Whatever else it is, Pinterest is increasingly becoming an image search engine. Accordingly, the company announced the hiring of Randy Keller, who until last month was a senior engineer working on Google image search. Keller was at Google for roughly a decade and was part of the Image Search Quality team. His Linkedin profile says he lead a team “of 40 engineers  . . . and was responsible for image search ranking, related images, guided search efforts and new emerging features like ‘Where to Buy’ and images appearing on web search.” Pinterest provided a quote from Keller about why he’s joining the company: Pinterest is the most exciting opportunity in visual discovery today, and I look forward to contributing my expertise in image search quality and ranking to the team r