Today, I'm going to reveal four Facebook applications we've got in development, give a brief description of each one, suggest some uses, and state why we think each is a Facebook killer app.
Before we started building, we defined two criteria that separate the good Facebook apps from the rest. First, the app doesn't take up a lot of space and second, it’s easy to use and share.
So with those in mind, we came up with four Facebook applications that would tie-in with our primary business model, creating professional digital audio.

Voices.com's Facebook Player
Let's jump to it.
Facebook Audio Wall
Description: Audio messages posted on your friend’s wall
Uses: Any Friend-to-Friend type messages
Ideas: Birthday greetings, Thank you messages, Congratulations messages, Come to my party, Come to my event
Recording Method: Call in to a phone number with your cell phone
Audio Limit: 60 seconds
Why it’s a killer app? Works with Facebook mobile m.facebook.com
Facebook Micro Podcasting
Description: Personal messages left for your friends on your Facebook profile
Uses: Any one-to-many type messages
Ideas: I’m having a party, want to come?, I’m going on vacation, It’s a boy!, I’m moving,
Recording Method: Call in to a phone number with your cell phone
Audio Limit: 60 seconds
Why it’s a killer app? “Words represent your intellect. The sound, gesture and movement represent your feelings.” Patricia Fripp
Facebook Podcasting
Description: Group messages left for a group and posted to a Facebook group
Uses: Any one-to-many type messages, targeted for a specific group
Ideas: Posting a recording from a lecture, seminar or other live event
Recording Method: Upload an MP3 file
Audio Limit: 1 hour
Why it’s a killer app? We need an alternative to the iTunes Podcast Directory.
Facebook Audio Ads
Description: Commercials uploaded to the Facebook marketplace when you post a new item.
Uses: Engaging Facebook marketplace visitors with audio to teach, inform and sell using the human voice.
Ideas: Concert promotions, messages from the vendor, sales messages to help sell a product.
Recording Method: Upload an MP3 file
Audio Limit: 5 MB
Why it’s a killer app? The audio ad can be sent to friends, with a link back to the original item, as displayed in the marketplace. Additionally, the audio could be downloaded to a cellphone, iPod or iPhone.
Would you use any of these Facebook applications? Add you comments below and say which ideas you like and which ones still need more work.
Best,
David





 
I desperately have a need for a simple Facebook application (and I think nearly everyone would have a use for it)
A Lost and Found application. I have found some things in my house and I'm sure they belong to my friends. I have lost something too, and it's probably at a friends house.
If anyone with the skills sees this, please create it!
Thanks
 
I want to throw this one out there... it's a great example of a very useful Facebook app.
http://apps.facebook.com/thenewsroom
 
I like the first two applications and have already developed a facebook application called "VoiceMail" It is still pending review as I just completed the application today. You can still add it even though it hasn't been approved for a directory listing.
The app can be found at:
http://umkc.facebook.com/apps/application.php?id=5466901629
Regarding the second two applications, my guess is you will have a hard time obtaining approval for such applications. Reason being? Users might violate copyright laws by taking advantage of the upload mp3 file feature. Here is an article about a similar application that used mp3 uploads that was shut down by facebook:
http://facereviews.com/2007/07/31/facebook-stops-the-music-audio-application-for-copyright-violation/
-Hardeep Khehra