Hello,
I am Actionscript 3.0 programmer working in Air, Flex and Flash. Please check my feedback and reviews here at https://www.freelancer.com/u/programmerAS3.html for further reference.
Regarding the project, well this depends plenty in which Graph API you are using. If your facebook Application is registered recently, then I guess it uses Graph API 2.5 or 2.6. Now the problem is, the libraries we have for AS3 is old one probably 2.1-2.3, and there have not been any updates. There has been changes in new Graph API. Recently, I fixed one issue for my previous client with the new facebook application and that is the reason why I was aware of it. Had this been using the previous library, it would have been very easy as you have stated, but this new Graph API made it bit difficult. Here, after getting the screenshot, we have to get permission of publishing the image to the friends facebook page. So, basically, not as simple and easy as it looks.
Let me know, if you have any questions.
Regards