The social part is, imagine like a github, where people put up code and you can see it? Same thing with stackfu. People can put up stacks and you can deploy them to your server.

Example: A user made a stack for Rails, you need rails, you go and deploy the guy's Rails stack. You'll be able to make a copy of it, edit it, review it, and make it yours if you want, fix it update and push your own version so other people can deploy it.

It reminds me of the community configs in EC2.

Are there any measures in place to deal with people who upload malicious stacks? Would they just receive negative reviews? Do you think you need to warn users to not blindly trust a stack?

Take a look at my reply to timmorgan:

http://news.ycombinator.com/item?id=1748915

I believe it's social because it's a community where people can share their own scripts and improve on existing scripts. As well as deploy them easily, of course.

It's a great idea I think.

If that's the case, maybe he should position it as an Appstore (or marketplace) for scripts?

That typically means there is a monetary component. I don't think that's the intended purpose.