Instagram takes the No. 1 spot on our list of top non-game Facebook apps growing by monthly active users this week with 5 percent gain. The app recently became the most popular app overall on the Facebook platform.

Titles on our list gained the most MAU of any non-game apps on the platform, growing from between 200,000 and 2.1 million MAU, based on our AppData tracking service.

No. 2 Amazon got a 25 percent bump, likely related to the holiday shopping season. Mobile integrations from Nokia, HTC Sense and Facebook for Windows Phone could be up in part because of people getting new devices as gifts.

Chat apps ooVoo, WhatsApp and WeChat are gaining in popularity. And navigation app Waze had a 9 percent increase to close our list at No. 20. Earlier today it was reported that Apple could be looking to acquire Waze to help with its Maps application.

Name MAU Gain Gain % 1.  Instagram 45,100,000 +2,100,000 + 5% 2.  Amazon 4,000,000 +800,000 + 25% 3.  Videos! 4,900,000 +600,000 + 14% 4.  I want to add your birthday 22,900,000 +600,000 + 3% 5.  schoolFeed 23,100,000 +500,000 + 2% 6.  ooVoo 3,000,000 +500,000 + 20% 7.  Nokia 16,800,000 +500,000 + 3% 8.  SlideShare 4,500,000 +500,000 + 13% 9.  Telly 1,400,000 +400,000 + 40% 10.  Rotten Tomatoes 5,800,000 +300,000 + 5% 11.  Bing 23,300,000 +300,000 + 1% 12.  YouTube 3,900,000 +300,000 + 8% 13.  Microsoft Live 26,000,000 +300,000 + 1% 14.  Flixster 2,800,000 +300,000 + 12% 15.  WhatsApp 890,000 +270,000 + 44% 16.  WeChat 1,700,000 +200,000 + 13% 17.  Keek 5,100,000 +200,000 + 4% 18.  HTC Sense 10,200,000 +200,000 + 2% 19.  Facebook for Windows Phone 4,700,000 +200,000 + 4% 20.  Waze 2,500,000 +200,000 + 9%