[3][4][non-primary source needed] Arment worked as lead developer and chief technology officer (CTO) of the Tumblr microblogging platform and social networking website from its inception in February 2007 until September 2010,[5][6][non-primary source needed][7][failed verification] when he left to concentrate fully on Instapaper,[8][9][10] a tool for saving web pages to read later.

[13][12] In July 2013,[14][non-primary source needed] Marco released Bugshot, an application to quickly mark up screenshots so that beta testers of Overcast could easily send him bug reports.

[19] He elaborated, "While [ad blockers] do benefit a ton of people in major ways, they also hurt some, including many who don't deserve the hit.

[30][non-primary source needed] It was picked up by Business Insider, The Huffington Post, CNN, Heise, and a televised CNBC discussion segment,[31] among others.

"[30][non-primary source needed] Arment expressed remorse for adding to the fear of imminent doom that regularly surrounds Apple instead of the more gradual decline in quality and constructive criticism he intended.