Installed moonlight on Ubuntu from source by following these instructions (there are some typo's but they are understandable and correctable).

All in all, even being still under heavy development, what Miguel de Icaza has achieved (with moonlight, just like with mono) is amazing.

After I posted the above picture on Flickr, John Montgomery was amazed to see PopFly (his creature) working on moonlight, and he linked to me from his blog.

PopFly lets you create mashups and even custom blocks, and I liked that too. But you have to use fancy-shiny Silverlight (which is very cool indeed, but probably not *always* necesary) and you can only create blocks using Javascript. Sure, as someone as already written, the meaning of AJAX is "javascript now works". I can understand (even if I don't know them for sure) the reasons behind certain choices. But I find it limiting. Maybe it is because I don't like Javascript. It must be it. 

Facebook, instead, empowers you to inject code into their social networking framework. Any code. In whatever language you like. They started it in PHP, but you can plug-in whatever you like: Java, Ruby, Perl…. you can even have your application running on your own server, still providing a seamless experience inside of facebook. This opens up to millions of possibilities, and I got fascinated by that.

At the same time, the paranoid part of myself has been thinking to the security implications of it. This open platform is cool, but it also sounds like a framework for cross-site-scripting (XSS) attacks. Sure, you can "report" an application made by a third party that does something weird… but who will really notice if all that happens under the hood is that your cookies get stolen (and someone accesses your bank account) ? Will you figure it out it has happenend because you wanted to see the "dancing pigs" loaded in your profile ? Or will you figure it out at all ?

This said, I set aside my fear for a while and I delved into coding. What I did learn in the last couple of years, having slowly moved away from security engagements, is to relax. When I was working costantly with security I was a lot more paranoid. Now I case much less, and I live a lot more.

So I developed a couple of quick and simple apps running from this very server into Facebook, and I started using thePHP5 library they provide, so to be able to follow the examples first and figure out how it was working.

Now I also want to take a look at the .NET library for facebook when I have time. It sounds cool.

You can build complex web-mashups in minutes.

Read on an interesting review at programmableweb.com and, obviously, more info at the official site http://www.popfly.ms