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In what way? Youtube runs on internal google hardware, GitHub runs on its own hardware too.

It could be a networking issue, but you'd expect more sites to be impacted.

If it were a software issue, you'd expect a big player like google to be aggressively patching and talking about a bad release.

More likely is its just a coincidence.

I'm not sure how you could postulate that they're related

Targeted attacks on specific aspects/assets of a major websites infrastructure? Eg target a specific service that both sites have in common in their back end?

Not even sure if that's feasible but it's an idea.

I figured it was just a coincidence, but the HN network is so well informed I thought I'd just ask the question on the off-chance it wasn't.

I personally don't find a relation likely.

Oh I find the relation very unlikely. I was just trying to think up a potential connection for fun/curiosity, as the coincidence is pretty crazy that two huge sites known for very few/little outages had major outages in the same week.

Github is not hosted by Google and was acquired by Microsoft some time back, so that seems... unlikely.