To fill you in on the joke if you did not get it… the green tiles appear to be similar to a GitHub user’s contribution history. See this page for an example: https://github.com/torvalds
Reminder: this is a social media feature to try to keep you on the platform. It’s okay to take a break, or just block the feature if it causes you anxiety.
Sure, but I really like to look at this when I'm deciding on wether an open source project is worth to use, if you can see that the author is relatively active.
A user’s activity on the Microsoft GitHub social media network/code forge is not a good indicator of a user’s activity in open source. There are gobs of free alternative forges, self-hosting, mailing lists, committing under different accounts. It’s as grain-of-salt worthy as how my ‘stars’ a project has for code quality.
If you're referring to the overhead style showerhead, personally I've seen them in the UK (no idea if it's the norm, but it's what I had access to) and a few times in the US, though it's definitely not the norm there.