Hidden Chronicles, Tetris, birthdays, tabs, WashPo, Pinterest, more on this week’s top 20 growing Facebook apps by MAU

Games were a big hit on our list of growing Facebook applications by monthly active users this week. There were also birthday calendars, page tabs, Yahoo, Washington Post’s Social Reader, Pinterest and BandRx. Titles on our list gained the most MAU of any apps on the platform, growing from between 700,000 and 5.4 million MAU, based on AppData, our data tracking service covering traffic growth for apps on Facebook.

Top Gainers This Week

1.  Hidden Chronicles28,900,000+5,400,000+ 23%
2.  MyCalendar – Birthdays29,400,000+2,600,000+ 11%
3.  Static HTML: iframe tabs89,100,000+1,700,000+ 2%
4.  Yahoo! Pages1,600,000+1,430,000+ 841%
5.  Static Iframe Tab49,400,000+1,400,000+ 3%
6.  Washington Post Social Reader8,700,000+1,400,000+ 19%
7.  MiCalendario – Cumpleaños15,900,000+1,200,000+ 10%
8.  Static HTML… [Sixth Tab]2,300,000+1,200,000+ 109%
9.  Fruit Ninja Frenzy2,600,000+1,000,000+ 86%
10.  Static IFRAME Tab : Note Icon2,100,000+900,000+ 75%
11.  Woobox Custom Tab | Star #31,400,000+870,000+ 164%
12.  BandRx11,400,000+800,000+ 8%
13.  Diamond Dash15,100,000+800,000+ 6%
14.  Pinterest9,100,000+800,000+ 11%
15.  Social Wars3,300,000+800,000+ 38%
16.  Tetris Battle13,700,000+800,000+ 6%
17.  Welcome tab app for Pages with TradableBits18,000,000+800,000+ 5%
18.  Bubble Witch Saga13,600,000+700,000+ 5%
19.  Hike FREE Tab Builder for Pages: New Static FBML4,300,000+700,000+ 19%
20.  MonCalendrier – Anniversaires4,700,000+700,000+ 18%

The games on our list this week came from developers ranging from Zynga to Wooga to King.com and Social Point. Usually with these types of games, feed stories appear and users send invites to their friends to play. Facebook has also been testing a “Discover New Games” module to drive users to games. At least one of these games, Bubble Witch Saga, has been running ads and Sponsored Stories to get new players.

This week’s list features a set of three birthday calendar apps — in English, Spanish and French — which purport to allow users to create a customized birthday calendar with friends’ birthdays, but require users to invite all their friends to use the app. There were also seven customizable page tab apps, some of which grew by more than 1 million MAU.

Then there was the Yahoo! Pages app, allowing users to Like pages from the company in different thematic areas. Washington Post Social Reader generates News Feed, Ticker and Timeline stories when users read stories. The Washington Post has also been supporting the application with Facebook ads. Musician app BandRx allows users to market their music on Facebook. Photo-driven social network Pinterest made the list, too. Pinterest uses Open Graph to generate Facebook stories when users interact with items on the platform.

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 Wednesday, and the top emerging apps on Friday.