SAN FRANCISCO — Evan Williams is at it again. Mr. Williams is sitting in an office here a mile up the road from Twitter, where he is a founder and is still a board member, working on Medium, an amorphous-sounding company that could be one more curio of the Internet age or might end up taking over the world.  

It’s hard to tell from talking to Mr. Williams. He is plenty thoughtful, but unlike so many other people I spent time with in San Francisco last week, he’s not a big talker.

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