Stefan follows these people on Refind.

Google’s high-performance open source JavaScript engine. Our mission: enable developers to build a faster future web.
Brad Frost
I am a web designer, speaker, writer, consultant, and musician in beautiful Pittsburgh, PA. Author of Atomic Design.
Smashing Magazine
An online magazine for professional Web designers and developers. Questions? We've got your back: @SmashingSupport and @SmashingConf.
Michael Hood
optimizing. i think about things a lot: #webperf, javascript loading, @chromiumdev. #perfmatters
Inian Parameshwaran
Founder @dexecure, JavaScript, Web Perf and Chocolates. Opinions are of my employer
Andreas Lenz
#Marketing, #SaaS & #Blockchain enthusiast, helping businesses & young founders grow their brands. ♥ 2 make things happen! CEO & Co-Founder of @t3n Magazine✌