Morgan Stanley analyst Brian Nowak said his recent talks with advertisers about Facebook have been mixed and he believes its ad revenue growth is being negatively impacted by lackluster engagement on core Facebook, the reduction in data and targeting capabilities that is impacting advertisers' ROI and continued growth of lower-monetizing Instagram Stories engagement. He lowered his FY19 ad revenue estimate due to these headwinds and raised his 2019 operating expense view, leading Nowak to lower his price target on Facebook shares to $175 from $185. However, he keeps an Overweight rating on the stock, stating that while Facebook is going through challenges, the company has shown an ability to innovate and drive engagement and monetization.