None of us at Twitter thought during the earthquake and ensuing tsunami in Fukushima, Japan, that our service would be a great alternative communication platform if the mobile networks in Japan were spotty in the aftermath. And certainly none of us even hoped, let alone considered, that our platform would be one of those used to organize protests across the Middle East, in Tunisia and Egypt during the Arab Spring. Hereís the amazing thing about what Iíve observed when Iíve witnessed all those things. Not only can you not plan the impact youíre going to have, you often wonít recognize it even while youíre having it. ... 

From here on out, you have to switch gears. Youíre no longer meeting and exceeding expectations. There are no expectations. Thereís no script. When youíre doing what you love to do, you become resilient, because thatís the habit you create for yourself. You create a habit of taking chances on yourself and making bold choices in service to doing what you love. If, on the other hand, you do whatís expected of you, or what youíre supposed to do, and things go poor or chaos ensues ó as it surely will ó you will look to external sources for what to do next, because that will be the habit youíve created for yourself. Youíll be standing there, frozen, on the stage of your own life.

-- Richard Costolo, CEO of Twitter