the fundamental idea is that Twitter lets people share moments of their lives whenever they want, be they momentous occasions or mundane ones. It is by sharing these moments as they're happening that lets people feel more connected and in touch, despite distance, and in real time. This is the primary use we saw of Twitter from the beginning, and what got us excited.

One of the many ways that users shaped the evolution of Twitter was by inventing a way to reply to a specific person or a specific message. So, this syntax, the "@username" that Shaquille O'Neal's using here to reply to one of his fans, was completely invented by users

Another is via the API. We built an application-programming interface, which basically means that programmers can write software that interacts with Twitter.

when you give people easier ways to share information, more good things happen.