Topping our list of emerging applications by monthly active users this week was canvas-based RPG game Dragon City.

We define emerging applications as those that ended with between 100,000 and 1 million MAU in the past week. This week’s top apps grew between 140,000 and 540,000 MAU, based on AppData, our data tracking service covering traffic growth for apps on Facebook.

Top Gainers This Week

Name MAU Gain    Gain,% 1.  Dragon City 890,000 +540,000    + 154% 2.  Lol Turtle + 540,000 +530,000    + 5,300% 3.  Tumblr 990,000 +450,000    + 83% 4.  Song Pop 470,000 +440,000    + 1,467% 5.  Baseball Heroes 630,000 +370,000    + 142% 6.  Birthday Reminder 340,000 +310,000    + 1,033% 7.  Jetpack Joyride 730,000 +310,000    + 74% 8.  Custom Tab | Star #2 510,000 +290,000    + 132% 9.  Glassdoor 850,000 +280,000    + 49% 10.  House M.D.: Critical Cases 990,000 +250,000    + 34% 11.  Zaman Tünelinden Kurtul 260,000 +230,000    + 767% 12.  HTML Page Tab #9 420,000 +230,000    + 121% 13.  Pot Farm 680,000 +230,000    + 51% 14.  Social TwitCam 190,000 +186,000    + 4,650% 15.  Smarter Than A 5th Grader? 890,000 +180,000    + 25% 16.  Tu estado de animo hoy 270,000 +160,000    + 145% 17.  Slide.ly – Photo Music Videos!        . 150,000 +140,000    + 1,400% 18.  The Fan Machine 450,000 +140,000    + 45% 19.  HTML Page Tab #10 460,000 +140,000    + 44% 20.   Referral 570,000 +140,000    + 33%

Meme sharing site Lol Turtle + saw a big spike in users since launching its Facebook integration that allows visitors to share funny or inspirational images on their Timelines. It came in at No. 2.

No. 3 on our list, Tumblr, is approaching 1 million monthly active Facebook-connected users since its big gain this week. No. 10 House M.D.: Critical Cases is also expected to pass 1 million users this weekend. Career resource site Glassdoor seems to have made a push to get users to connect with Facebook, as it’s up nearly 50 percent this week.

Games, quizzes, photo-sharing and welcome tab apps rounded out the list.

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