In another discussion thread I proposed this very simply outline of how I see Google. I thought I'd post it again as its own topic for people to discuss:

Google 1.0 was a new company that changed the way we search for content on the internet and it became a household name.

Google 2.0 developed a set of consumer services like email, apps, maps, YouTube, etc.
Google 2.5 started to provide those services to the Enterprise and Education markets

Google 3.0 built a revenue model to layer onto #2 via advertising. The majority of non-techies probably have no idea that this is their core business

Google 4.0 is about building a new "social DNA" across all Google properties as well as across the web. This will try together people and content, and provide even more context for Google's Ad business.
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