>what if I'm on duolingo learning Spanish? What if I'm checking my investments or making a trade?

...ah, the Paul Erdos defense:

http://amphetamines.com/paul-erdos.html

> I spend too much time on my phone, but a lot of it is useful and productive.

Looks like we might need to an another item to the list:

http://www.magicmgmt.com/magic/abuse-excuse/