"The idea of Twitter started with me working in dispatch since I was 15 years old, where taxi cabs or firetrucks would broadcast where they were and what they were doing."

"I think Twitter is the future of communications and Square will be the payment network."

"Anything you're interested in the world whether it be Charlie rose or JetBlue or a public figure or your local coffee shop, they're on Twitter and broadcasting what is interesting to them."

"IM is interesting because you look at your buddy list and, at a glance, see what your friends are listening to, what they're working on, what they're doing. The problem was that you were bound to the computer keyboard."

"Don't avoid eye contact and don't be late"

"My goal is to simplify complexity."

"TweetDeck is a very interesting client, because it presents a view that no other client in the world presents, which is this multicolumn, massive amounts of information in one pane. And people really, really enjoy that."

"Twitter was around communication and visualizing what was happening in the world in real-time. Square was allowing everyone to accept the form of payment people have in their pocket today, which is a credit card."

"Meet customers where they are; question how to make the tools customers use more valuable."

"'Luck' is recognizing when the situation encourages build out and execution."

"Twitter is the world."

"As CEO, my main job is editor-in-chief."

"My mom cares that I tweeted a picture of my breakfast. She's knows I'm eating and I'm safe."

"Amazing what people make up based on what they choose to see."

"What I love about New York is just the electricity I feel right away."

"Twitter has been my life's work in many senses. It started with a fascination with cities and how they work, and what's going on in them right now."

"I am someone who tweets about what I have for breakfast, what I have for lunch, what I have for dinner, and for 99.99999 percent of the world, it's useless. It's meaningless. But for my mother, she loves it."

"Life happens at intersections."

"I spend 90% of my time with people who don't report to me, which also allows for serendipity, since I'm walking around the office all the time. You don't have to schedule serendipity. It just happens."

"Pick a movement, pick a revolution and join it."

"I think Twitter is best when it sparks conversations elsewhere. To use YouTube and Facebook and all the tools we have available to us today to respond and also promote and answer and engage is awesome."

"From a product standpoint, we want every touch point to feel magical. It inspires trust."

"My goal is to simplify complexity. I just want to build stuff that really simplifies our base human interaction."

"Great companies don't just have one founding moment. They have many founding moments."

"I was fascinated with jeans, because you can impress your life upon the jeans you wear. The way you sit imprints on the jeans."

"It's really complex to make something simple."

"Revolution looks at the intersection ahead and pushes people to do the right thing."

"Everyone has an idea, but it's really about executing the idea and attracting other people to help you with the idea."

"Build what you want to see in the world."

"Starting anything is a roller coaster with the highest highs and lowest lows."

"We get to design what we want to see in the world rather than doing what other people think should be done."

"Constraints inspire us in how we approach the press, how we approach business relationships, how we do everything."

"There's an entire universe in every single tweet, and it all really depends on the content as far as how it's going to spread."

"Technology to me does two things: it increases the velocity of communication and increases the number of people who can participate. That's it. That's really all technology for our entire history has ever done."

"An idea that can change the course of the company can come from anywhere."

"Short term satisfaction will never lead to something timeless."

"The strongest thing you can cultivate as an entrepreneur is to not rely on luck but cultivating an ability to recognize fortunate situations when they are occurring."

"Success is never accidental."

"Making something simple is very difficult."

"Make every detail perfect and limit the number of details to perfect."

"The greatest lesson that I learned in all of this is that you have to start. Start now, start here, and start small. Keep it Simple."

"It's empowering to be asked to look at what's possible, not told how to do it."

"Your job as an executive is to edit, not write. It's OK to write once in a while but if you do it often there's a fundamental problem with the team. Every time you do something ask if you're writing or editing and get in the mode of editing."

"The Web provides a very easy way to immediately grasp what's going on. It really offers the transparency, so you can see, especially with the search engine, how people are using Twitter at one glance. The phone doesn't allow for that."

"The interesting products out on the Internet today are not building new technologies. They're combining technologies. Instagram, for instance: Photos plus geolocation plus filters. Foursquare: restaurant reviews plus check-ins plus geo."

"All my days are themed. Monday is managementTuesday is product, engineering, and design. Wednesday is marketing, growth, and communications. Thursday is partnership and developers. Friday is company and cultureOn the days beginning with T, I start at Twitter in the morning, then go to Square in the afternoon. Sundays are for strategySaturday is a day off."

"You don't have to start from scratch to do something interesting. You don't have to start from scratch to have a massive impact on the world. You have to have a good idea. You have to convince other people of those good ideas. And you have to push as quickly as possible."

"I'm less interested in how people are following each other and more interested in how they are following topics and tweets themselves. People are following more key words and concepts and more ideas and acting on those rather than individuals or organizations."

"The first complaint we hear from everyone is: 'Why would I want to join this stupid useless thing and know what my brother's eating for lunch?' But that really misses the point because Twitter is fundamentally recipient-controlled - you choose to listen and you choose to leave. But you also choose what to put down and what to share."

"I said a long time ago that Foursquare can make cities better. You have these augmented realities like Foursquare and Twitter and Facebook that provide these virtual nodes and instant feedback from anywhere, adding annotation around a physical places."