I actually don't mind Facebook ads. If I'm on Facebook already, there's no additional javascript loading and hogging my browser with dozens of megabytes of tracking scripts. From performance point of view, browsing FB is a better experience than your average web site these days.
Facebook also tracks a variety of metrics related to their ads, and the data collection is implemented through JavaScript or other methods of triggering web requests. These methods do impact performance.
https://www.facebook.com/business/help/735720159834389
https://www.indiatoday.in/technology/news/story/facebook-con...