Android: Facebook's new weapon against Google

The last time Google and Facebook had a chance to make friends was October 2007, when the two companies discussed an advertising alliance. Ultimately, Facebook snubbed Google in favor of archrival Microsoft.

It's all been downhill since then. As Facebook grew to become an Internet superpower, it liberally poached engineers, salespeople and executives from Google. Time and again two companies fought over advertisers and squared off on privacy, with Facebook even orchestrating a secret smear campaign against Google. Google fought back, paying astronomical sums to retain its talent, and most notably, spending billions to develop Google+, a Facebook rival. More recently, Facebook has sought to encroach into Google's multi-billion search franchise.

Now, Facebook is taking aim at another of Google's crown jewels, the open-source Android operating system for mobile devices.

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