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The article missed:

I found an eager soul in a foreign country with similar skills for less than half your salary.

And: when I walk down the aisle and hear browsers clicking as I approach, I DO know you were on Facebook.

What if I was on GitHub, looking at the kind of software the boss doesn't see the importance in using/writing?

Sometimes, "goofing off" is actually your employee preparing for a future job at a different company. Maybe even his/her own.