Can anyone explain what the number before the timestamp is?
GMT 66 / 43 / 41
It's the DayOfTheYear followed by Hours, Minutes and seconds in UTC.
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doubleclick.com might not be terrible for most, though.
Interesting enough, it does not add headers when accessing a country specific google domain in the EU - such as google.de or google.fr. Is that GDPR kicking in - with a nod the the brexiteers given that google.co.uk gets these headers... ?
It's not purely a function of 'date published' it is also about frequency of access
not sure about this one yet