Question for the Adobe staff:
Did the "Share to Facebook" functionality change in the latest version of PS Touch? I can't seem to find it when I tap the "share" icon. (If I need to have the actual Facebook app installed, what's the point of signing into Facebook within PS Touch?)
Since PS Touch version 1.4.1 the facebook export is handled by the OS.
As soon you have the Facebook app installed/enabled on your device you will see the facebook option for sharing under "Share"
This applies to e.g. Twitter, Picasa as well.
Hope that answers your question.