What you need to know - Friday 12/24/10

Zumbox raised $9.7M; Pixelfish $2.1M; Cityville biggest game on Facebook; gifts you can email

CityVille has become the biggest social game on Facebook. The game, which is made by Zynga, has 61.7 million monthly active users. It unseated another Zynga title, FarmVille, which has 56.8 million monthly active users.

The guide to last-minute Christmas gifts you can email has arrived on Vator. The guide features gifts that you can download, email, or print out. No muss. No fuss.

Moblyng (formerly FlipTrack) is looking to raise $10.9 million. The company hopes to use the funds to develop cross-platform HTML5 games for mobile devices. The company has already secured about $7.5 million for the round.

Zumbox, a digital-mailbox and filing system, has rasied about $9.7 million in venture capital.

The Facebook Data Team released a, 'What’s on your mind?' report. The report shows what users post, and what post's get comments.

Callidus Software, a maker of sales performance management software, is going to  acquire ForceLogix.

Yandex, a popular Russian search engine, has acquired WebVisor. The terms of the deal were not disclosed.

Skype is planning to compensate paying users, for the day-long downtime earlier this week. Details of the compensation have yet to be revealed.

Google and the North American Aerospace Defense Command (NORAD) are joining up to track Santa's flight. Tracking begins at 3:00am, Pacific Time, on 12/24.

Pixelfish, a video advertising service, has raised $2.1 million in Series B funding. Specifics of the deal were not released.