Here's a very cool little piece at Wired showing how Blogger spawned a lot of the current "push button publishing" services we know today:
At the close of 1998, there were 23 known weblogs on the Internet. A year later there were tens of thousands. What changed? Pyra Labs launched Blogger, the online tool that gave push-button publishing to the people. It was a revolutionary web product made by a revolutionary web of people who went on to build much of the modern net. Here’s how Pyra propagated.
The "family tree" you find when you click through to Wired does a great job showing how the people behind blogger went on to create/influence Twitter, Square, Adobe Creative Cloud, etc.