This week saw Facebook users getting in the holiday spirit as Christmas apps continued to make their way into people’s daily regimen. To start, the top three apps with the most new daily active users this week have remained largely unchanged from last, with two expanding their daily user base by over 50 percent. Farmville by Zynga netted another 1.8 million daily users to a new high of 28.4 million.

Second on the list, Birthday Cards by RockYou! added 1.7 million for a total of 2.9 million and Quiz Planet! by Friendly Quizzes rounded out the top three with 836,000 new people adding to the sites 1.2 million total; a 72 percent increase over last week and a high for the app.

	Name	DAU	Gain	Gain, %
1.	FarmVille	28,407,350	+1,818,215	+6.40
2.	Birthday Cards	2,995,309	+1,769,703	+59.08
3.	Quiz Planet!	1,167,752	+836,389	+71.62
4.	Happy Pets	2,591,872	+685,694	+26.46
5.	Christmas Cards!	696,857	+656,529	+94.21
6.	Snowball Fight	938,561	+447,107	+47.64
7.	Mobile	5,449,394	+420,579	+7.72
8.	Friend Quiz	1,237,220	+411,667	+33.27
9.	Pet Society	5,094,052	+369,350	+7.25
10.	Christmas Cheer	702,997	+365,899	+52.05
11.	FishVille	7,170,123	+363,752	+5.07
12.	Fish Isle	834,294	+356,148	+42.69
13.	Mafia Wars	7,021,764	+338,498	+4.82
14.	Texas HoldEm Poker	4,727,388	+334,836	+7.08
15.	Facebook for BlackBerry® smartphones	6,792,527	+324,346	+4.78
16.	Translations	317,812	+317,747	+99.98
17.	Christmas goodies	336,319	+285,395	+84.86
18.	YoVille	3,233,857	+219,647	+6.79
19.	Is Cool by cafe.com	663,493	+199,009	+29.99
20.	@Smiles	225,629	+170,944	+75.76

Translations, used to let Facebook users translate the site into other languages, rose by 99 percent this week to place at 17th, the week’s largest gainer overall. Developed by Facebook in 2008, 316,000 new daily active users found a need for the application this week, while last week had an average of 1,794. However, fluctuation is common for this app, which saw an average of 308,000 users two weeks ago before dropping to the before mention 1,794 — it’s not clear what is going on, exactly.

@Smiles, developed by @Apps, was the second highest growing non-holiday themed app at 75 percent. At 19th on the list, the service rose from 54,685 daily active users on December 2, to 225,629 yesterday. And, if comments on the developers page are a sign (and they are), this app has strong international support.

Good news was bad news for new and established apps as three Christmas-themed ones made their way on to this weeks list. Christmas Goodies, Christmas Cheer and Christmas Cards! jumped on to this weeks list, bumping last months Thanksgiving apps off the list and overall, upsetting the balance of the top 20′s lower half.

The strongest performing of the three was Christmas Cards at #5 which could be benefiting from an established user base from last year. Despite a two-star rating on Facebook, the app remains popular, increasing by 94 percent with a total of nearly 695,000 daily users from 620,000 daily active users last week.

Farther down the list, Christmas Cheer by Mob Science saw it’s user-base jump by 52 percent, or nearly 366,000 daily active users, to place at #11 in its first holiday week on Facebook.

Finally, Christmas Goodies was the second-fastest gaining app with 85 percent, but still placing 18th on the list overall with a user base of 336,319 yesterday.

Next week these numbers are likely to change mostly due to new Christmas-themed apps like Sexy Santa Helpers, Santa Yourself and Holiday Drinks (also by Mob Science) edging towards the top 20, propelled by Christmas cheer that should increase as the holiday approaches.