I implemented FaceBook connect a while back and it looks like there is a new api.
What are the changes in implementation or what are the differences?
Can the "old" one be used?
I recently developed an app a month ago and used old connect API in it which i've already integrated in my earlier apps, but it's not working on ipod touch with iOS4.1 (actually my client had this device).. It's working on every other device except this one.. So then I moved to newer Graph API and then it started working on the iPod Touch too.. So i recommend to go with the latest API... There's a nice tutorial available here:
http://www.raywenderlich.com/1626/how-to-post-to-a-users-wall-upload-photos-and-add-a-like-button-from-your-iphone-app
This tutorial will show you how to post pictures asynchronously on Facebook and other useful tutorials are available there too.