Gina Trapani (Lifehacker): https://plus.google.com/113612142759476883204/posts
Merlin Mann (43folders): https://plus.google.com/100537991844787325512/posts
Marco Arment (Instapaper): https://plus.google.com/110386126391315414323/posts
Tim Bray: https://plus.google.com/107606703558161507946/posts