The Facebook-owned mobile photo sharing app Instagram is the No. 1 most popular app in terms of monthly active users logging in with Facebook.

One year ago, Instagram had only 3 million Facebook-connected MAU. Now it has more than 44.8 million MAU, first taking the No. 1 spot on Dec. 29, as it surged and FarmVille 2 and TripAdvisor™ declined.

Off-Facebook integrations, including web, mobile and desktop apps, have gained significantly over the past year. Eleven of the top 25 apps exist completely outside of the Facebook chrome, and five of Zynga’s games on the list have versions that are playable on Zynga.com rather than Facebook.

Games and apps within the Facebook canvas don’t dominate the charts as they did in year’s past. For example, one year ago Static HTML: iframe tabs was the No. 1 app with more than 58 million MAU. That app isn’t even in the top 25 any more after Facebook eliminated the option for pages to set custom apps as the default landing tab.

See more popular apps and browse by category by visiting AppData.

Name MAU 1.  Instagram 44,808,894 2.  FarmVille 2 43,500,000 3.  TripAdvisor™ 34,293,922 4.  Texas HoldEm Poker 34,000,000 5.  Microsoft Live 26,000,000 6.  I want to add your birthday 25,500,000 7.  Spotify 24,600,000 8.  Candy Crush Saga 23,500,000 9.  Bing 23,300,000 10.  schoolFeed 23,100,000 11.  I want to add your birthday 22,800,000 12.  Yahoo! Social Bar 22,300,000 13.  Diamond Dash 21,600,000 14.  Samsung Mobile 21,500,000 15.  ChefVille 20,900,000 16.  Pinterest 20,500,000 17.  Bubble Safari 19,400,000 18.  Bubble Safari Ocean 19,100,000 19.  Scribd 17,800,000 20.  Dragon City 17,600,000 21.  Skype 17,200,000 22.  Bubble Witch Saga 16,700,000 23.  Nokia 16,700,000 24.  CityVille 2 15,900,000 25.  Static Iframe Tab 15,400,000