Facebook Blues
The Facebook Blues is the blue used on Facebook, which is the same blue as the color code #4267b2. You see it everywhere and it makes you feel like you're back on Facebook again.
This website has the same blue as Facebook, and I got the Facebook Blues again.
I saw that blue and it felt like I was back on Facebook for hours.
This app uses the same blue as Facebook, and it made me feel like I was back on Facebook for days.