To make good on its ballooning multibillion-dollar valuation, online-messaging service Twitter Inc. must pass the Sephora test. Initially, Sephora, the makeup retailer that is part of luxury-brand-giant LVMH, didn’t allocate any funds for Twitter’s young advertising system for this year. But in February, it bought more than 15 Twitter ads to promote a contest for …
![](https://i0.wp.com/mosnarcommunications.com/wp-content/uploads/2011/07/Sephora-opi-glee.jpg?fit=529%2C385&ssl=1)
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