I've started creating this on my forum (its still in the early stages)
I'm currently using this plug-in to order upcoming events by "tweets"
This makes more people want to tweet their own events (several times) in order to be displayed on the first page of the forum
The first version can be seen here (on the right hand Column: Top Shared Upcoming Events)
Is there much of a market for this, is this something people need (is it worth me designing it so everyone can use it as a plugin)?