Great site that could a huge amount of publicity over the last few days, so much so that it has been experiencing some downtime. I hope it goes really well for them. Sorry, but I don't know what script it uses. I would imagine that it is custom built.
Looks like a blog. Yeah, it really just looks like a blog with short titles, no sample text, and a custom theme/plugins...
great idea. It does kind of look bloggy - but there must have been some serious hacking of the script to make it do that. I'm willing to be disabused of this notion, of course - never underestimate the genius of plugin writers...
I know another micro tasking site GigBux dot com uses php and mysql. That's pretty standard for all these web 2.0 sites.