AdspyHub

AdspyHub is a free facebook advertising SPY tool that can provide：

• Provide over 1 billion+ Facebook advertising data
• Provide 35+ country classification, 45+ industry classification
• Provide a post to view the latest posts and history of an advertiser
• Provide classified advertisers’ leaderboards
• Provide country-specific advertising charts
• Update over 1 million data per day

The important thing is that it is completely free, you only need to sign up for an account to use it.