Birthdays takes the No. 1 spot on our list of top non-game Facebook apps growing by monthly active users this week with 9 percent gain. Similar birthday reminder applications came in at No. 6 and No. 12.

Titles on our list gained the most MAU of any non-game apps on the platform, growing from between 300,000 and 11.4 million MAU, based on our AppData tracking service.

Photo apps were popular this week with No. 4 Photo Contest, No. 9 Photo Love, No. 10 Mis Fotos, No. 16 Photo Roll and No. 17 PhotoMania.

No. 2 Instagram, No. 3 Yahoo! Social Bar and No. 20 Identified all use Facebook Open Graph to share user activity and grow their apps.

Top Gainers This Week

Name MAU Gain Gain % 1.  Birthdays 20,600,000 +1,700,000  + 9% 2.  Instagram 41,700,000 +1,300,000  + 3% 3.  Yahoo! Social Bar 22,400,000 +800,000  + 4% 4.  Photo Contest 3,400,000 +600,000  + 21% 5.  Daily Horoscope 5,600,000 +600,000  + 12% 6.  Birthdays 27,000,000 +500,000  + 2% 7.  JibJab 2,700,000 +500,000  + 23% 8.  Skype 16,700,000 +400,000  + 2% 9.  Photo Love 5,800,000 +300,000  + 7% 10.  Mis Fotos 3,900,000 +300,000  + 8% 11.  Fox News 280,000 +276,000  + 6,900% 12.  我的日历 – 生日 1,200,000 +270,000  + 29% 13.  My Christmas Tree 2012 580,000 +210,000  + 57% 14.  HTML Page Tab #8 1,500,000 +200,000  + 15% 15.  Static HTML Iframe Tab : Custom Icons 2,900,000 +200,000  + 7% 16.  Photo Roll 1,400,000 +200,000  + 17% 17.  PhotoMania 2,700,000 +200,000  + 8% 18.  Ask.fm 5,500,000 +200,000  + 4% 19.  My Friend Secrets 4,000,000 +200,000  + 5% 20.  Identified 6,500,000 +200,000  + 3%

All data in this post comes from our traffic tracking service, AppData. Stay tuned for our look at the top weekly gainers by daily active users on Thursday, and the top emerging apps on Friday.