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Noah Glass states that he named Twitter (orignally called Twttr). He does concede that Twitter creation was a group effort. The site originally ran from his laptop. Glass wanted to spin Twitter off from Odeo as a separate company.
Evan Williams was the CEO who fired Glass. He previously worked for Google. When Odeo was becoming irrelevant, he asked employees to come up with new ideas. They came up with the idea for Twitter. Williams spent around $5M to buy the company back from investors. Then he let Glass go.
Evan Williams is the creator of Blogger. You know he has the power. That includes the power to kick out a cofounder. Ouch. How do you protect yourself against such tactics? I don't know. Maybe you got to be a single founder with your own funding.