Dick Costolo — American Businessman born on September 10, 1963,

Dick Costolo was the CEO of Twitter from 2010 to 2015; he also served as the COO before becoming CEO. He took over as CEO from Evan Williams in October 2010. On June 11, 2015, it was announced that Costolo would step down as CEO on July 1, 2015 and would be replaced by Twitter co-founder and chairman Jack Dorsey on an interim basis until the Board of Directors could find a replacement. On August 8, 2015, The New York Times reported that Costolo would be leaving Twitter's Board of Directors by the end of the year or when a new CEO is appointed... (wikipedia)

The interesting thing about the top 200 to 300 tweeters - a lot of them are musicians, actors, etc. LeBron James, etc. I think Lady Gaga is number one. But! They're not all celebrities. There's 'CNN Breaking News.' And the 'New York Times.' And other brands like Gary Vaynerchuk, who aren't really that known outside that world.
The way you build trust with your people is by being forthright and clear with them from day one. You may think people are fooled when you tell them what they want to hear. They are not fooled.
What I implore you to do is believe that if you make courageous choices and bet on yourself and put yourself out there that you will have an impact as a result of what you do, and you don't need to know now what that will be, or how that will happen, because nobody ever does.
I was in Shanghai recently, where Twitter is blocked, and yet there were ads and billboards across town with hashtags on them.
As a leader, you need to care deeply, deeply about your people while not worrying or really even caring about what they think about you. Managing by trying to be liked is the path to ruin.