Twitter App - Animation of Tweets

We need a web app to monitor tweets with regard to certain hashtags. Requirements: 1- Monitor tweets that include hashtags that include certain hashtags ( hashtags to be input by user) 2- Develop interface to let moderation of retrieved tweets 3- Display the tweets that are allowed after the moderation 4- Display tweets as a list but when a new tweets is moderated, show that tweet with an animation effect as it does in [login to view URL] Note: Animation effect is very important. Feel free use whatever method/tool (Flash, Silverlight etc...) to implement the animation mentioned in 4. The developed web app will be used in seminars and conferences. Take into consideration that the list of tweets will be projected to a very large screen, if you need to work with any resolution/pixel aspect.