A Facebook director has dismissed claims that the social network ditched last years big redesign because it was bad for ad revenues. Those claims came from Dustin Curtis, a UX designer and writer who owns the publishing platform Svbtle. In a blog post on Friday, Curtis cited several sources saying Facebook found that testers of the redesigned News Feed were spending less time in user profiles and event pages. The new News Feed was performing too well, says Curtis this change in user behavior led to fewer advertisement impressions, which led, ultimately, to less revenue. However, according to Facebooks product design director Julie Zhuo, Curtis sources are incorrect.