No. This is a Mendel meme.

There’s usually a bar at the top, otherwise it looks like this. The dock on the left is from the “dash to dock” Gnome shell extension, which ships with Ubuntu

Most use a dating app named Cinder

You can just take it for what it is: How people respond when asked to grade their happiness from 1 to 10. Of course it’s subjective, but it’s interesting that arch users rate their happiness lower overall.