Kevin Systrom

The Gmail app is definitely the app I use the most. I am always running from meeting to meeting, so it keeps me up-to-date with everything going on. I actually e-mail more often from my iPhone than my laptop, so having a nicely designed e-mail app is really important.

Over the past decade... while many businesses have pursued what I call 'business as usual,' I have been part of a different, smaller business movement, one that tried to put idealism back on the agenda.