In social media, we see people -- entrepreneurs, activists, disruptive thinkers, politicians, educators, journalists -- with content that is informational, inspirational, even aspirational.

The Twitter Powerhouses Series is not a destination, it is a journey. And what a journey it has been. Thanks so much for making it an enjoyable and thought-provoking ride.

All of the writers on this post have met Pulver. We believe there is something impressive about an accomplished visionary who remains humble, and works vigilantly to keep the social media door of opportunity wide open for others.

Marc Parent, one of the most celebrated observers and activists on Twitter today, dedicates his thought-provoking feed to shining a spotlight on that history, and provides great links that are often the subject of great debate.

Visionaries like Brett Petersel and Courtney Wiley have long argued that social media needs less superstars, and instead, more "superstar thinking." Twitter's Aaron Lee couldn't agree more.

The 16 Tech Titans below are amazing global citizens. Yes, we call them titans. Not just because of the greatness of their achievements, but because they believe in moving humanity forward.