While Yahoo's thinking of moving some of its operations to Omaha, Nebraska, Facebook plans to double its U.K. sales and marketing teams in London, the third most expensive city in the world. Facebook will increase its staff on the island to about 40 as part of its push to get European advertisers hooked on its new "engagement ads," the ads where advertisers pay Facebook for pointing out to users how their friends are interacting with the advertiser's brands. Facebook commercial director for Europe Blake Chandlee will remain in charge. Just a thought, but shouldn't Facebook ascertain whether domestic marketers have any interest in engagement ads before pushing them abroad? Some marketers say they're approaching them only with caution. (Photo by Ian Muttoo)

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