The 11 Most Important Google Acquisitions Ever

Google has spent more than $28 billion on a whopping 163 companies since 2001. That's almost one company per month.

The search-engine-that-could has purchased all kinds of companies, services and technologies - from mapping companies to security services to gadgets and robots to gaming and facial recognition software and much, much, much more.

But with so many companies, we thought it'd be fun to look at the top 11 companies and services Google has acquired over the years, based on how they've impacted Google's business.