Google’s cool new tool, Trends for Websites, sounds pretty great: If anyone is going to build a powerful competitor to Web measurement firms Compete and Quantcast, you’d think it’d be the Mountain View crew.
But there are two things you should know about the tool:
- It doesn’t actually gives you Google’s raw data — it uses some search data, some data from Google Analytics, and some data from market research firms, among other sources.
- And there’s one site it won’t measure: Google’s.
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