Instagram, a photo sharing app acquired by Facebook this year, is the No. 9 bestselling free Facebook app for the week, according to research from AppData. The app, which lets users add filters to photos, has seen 23,900,000 average monthly users this month, according to AppData.

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

To prepare for Mediabistro’s upcoming Media App Summit on December 4, 2012, we spotlight the top free apps every week–helping our readers discover, enjoy and analyze successful content.

Top Free Facebook Apps of the Week (with Monthly Active Users Count)

1. Socialcam 47,500,000
2. TripAdvisor™ 36,900,000
3. Yahoo! Social Bar 36,200,000
4. Texas HoldEm Poker 35,100,000
5. Bubble Safari 28,600,000
6. Spotify 25,200,000
7. Bing 24,700,000
8. Microsoft Live 24,600,000
9. Instagram 23,900,000
10. CityVille 23,200,000

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.