I run Ghostery in Safari on my Mac. Currently I’m allowing Google Analytics (stats), Adobe TypeKit (fonts), and The Deck (ads).
Here is why The Deck is the only ad network I’m currently allowing through.
Some may block TypeKit for speed but I don’t mind a small amount of load time to read the current site how the designer wanted the typeface to be. And I don’t block Google Analytics because I don’t mind, generally, what it tracks and how that information is generally used inside of publications.
To date I do not block anything on iOS 9. But I may at some point in the future.