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Filtering out GA sessions with the language of "C" (versus actual languages like en-us, fr, etc.) goes a long way in filtering out GA spam.

This language code is 99% of the time associated with bots. I had one site where 20% of all the sessions in a given month was such fake traffic!


Isn't that a relatively easy thing for a spammer to change? Also, I'm seeing some valid traffic coming in with that language (conversions and everything).


Most won't bother


Sure, but even still, if I'm seeing valid traffic with this, then on its own it isn't sufficient to use as a filter.


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