fbmFacebook Messenger is the top free iPhone app this week. The social networking app has been redesigned for iOS7. Now users can chat with people in their phone book using the app. They don’t have to be Facebook friends.

Below, we’ve listed the top free iPhone apps of the week. The list links to Inside Network’s research about the individual apps, including historical charts, developer information and download information.

Every week we spotlight the top free apps every week–helping our readers discover, enjoy and analyze successful content.

Top Free iPhone Apps of the Week

1. Facebook Messenger Facebook Messenger
2. QuizUp: The Biggest Trivia Game In The World! QuizUp: The Biggest Trivia Game In The World!
3. Hot or Not! Hot or Not!
4. Circle - The Local Network Circle – The Local Network
5. ElfYourself by OfficeMax ElfYourself by OfficeMax
6. LAWLESS LAWLESS
7. Flipagram Flipagram
8. Snapchat Snapchat
9. Santa Rescue Saga : Doctor X Christmas Adventure Santa Rescue Saga : Doctor X Christmas Adventure
10. YouTube YouTube

More detailed stats are available at AppData Pro, Inside Network’s data service supplying performance data, including historical user data, audience demographics, and company information for developers and applications.