I tagged David because he participated in the claps giveaway :)

There are some funny articles about his highlighting habits (he also leaves very interesting comments sometimes)

https://medium.com/doctor-funny/david-perlmutter-is-the-top-highlighter-on-medium-4d27057ed1a5

https://medium.com/bichodomato/your-finger-just-clicked-publish-you-have-been-perlmuttered-already-8160f58150bc