Its the weekend before the 4th of July, the independence day for USA - many employers give employees Monday and Tuesday off, creating a potential four day break during what is typically very good weather - that being said Twitter is presumably (still) an international company with people in all different holiday areas.
The "America is the default" is tiring. The US makes up ~ 5% of the population, and most of us do not default to American thinking.
You’re in an America conversation thread, whether you like it or not.