In another ominous sign for online ads amid the coronavirus outbreak, Facebook on Tuesday warned the global battle against the coronavirus outbreak has impacted advertising budgets. "We don’t monetize many of the services where we’re seeing increased engagement, and we’ve seen a weakening in our ads business in countries taking aggressive actions to reduce the spread of COVID-19," Alex Schultz, vp analytics, and Jay Parikh, vp engineering, said in an updatevia the Facebook website.