Twitter’s a ubiquitous service these days, but 11 years ago it was just the beginning of an idea rolling around in Jack Dorsey’s head. Dorsey, in this Entrepreneur Thought Leader Lecture given at Stanford University, tells of the days he first tested the idea – broadcasting his notes and thoughts to friends and family via an email list from his then-revolutionary Blackberry. Things didn’t go quite as smooth then as they did when he launched the service six years later.

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