Google and Facebook are working toward the same ends: they both want to be the place you start your online activity, stick around for awhile and discover other things through. Google started with search and then mail and messaging and is now adding social network features while Facebook started with social network features and is now adding email and messaging.
Both companies are notorious for allegedly being loose with users personal information, giving them an interesting Coke vs Pepsi style marketing war when trying to convince the consumer that they are the better choice.
Here is what you are shown when you try to import your Gmail contacts information into Facebook:
