Sorry, Facebook. When a user opens, downloads, or updates an app for the first time after they download the new iOS, they have to opt in to letting that app track them. According to Verizon Media-owned Flurry Analytics, almost everyone is saying "no, thanks." Just around 4 percent of U.S. users have said "yes." Flurry is an analytics tool that the company says is installed in 1 million apps. Since iOS 14.5's public launch, it has been tracking the opt-in rate every day using data from 2.5 million devices. That rate has consistently been around 4 percent for users in the United States. It's significantly higher worldwide, with average daily opt-ins around 12 percent.