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I don't see how this has anything to do with Facebook specifically as any 3rd party JS script can do this. Clickbaity title.

• smt88 8y ago
  It's an extremely common and well-known library. Why is that clickbait? It's also helpful to study one concrete example at times. We know what Facebook collects and how they use it, and that closes the loop on whether this is scary vs. merely interesting.