Callista wrote:
Social anxiety is a fixable problem; Asperger's is a permanent brain configuration.
The boundaries between what is described as a permanent brain configuration and a fixable problem are less clear than the above suggests. There are various neurological and genetic factors associated with SA as well (e.g., evidence for impaired reading of facial expressions). There are various etiological mechanisms that lead to the similar behavioural expressions that result in fulfilling the diagnostic criteria for social phobia, and for many, the available treatment options cannot fix their problems; it's not a unitary disorder.
Callista wrote:
I sometimes think that many people blame on Asperger's what should actually be blamed on co-morbid social anxiety disorder...
It can be very difficult to separate AS and co-morbids, which often overlap at the neurological level. AS and anxiety occur together more frequently than not, and the evidence from family studies, for example, shows they are closely linked.
For interest, there is one social phobia criterion in the DSM that mentions PDDs and other condtions:
G. The fear or avoidance is not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication) or a general medical condition and is not better accounted for by another mental disorder (e.g., Panic Disorder With or Without Agoraphobia, Separation Anxiety Disorder, Body Dysmorphic Disorder, a Pervasive Developmental Disorder, or Schizoid Personality Disorder).
This implies that they consider someone with a PDD (for example) who experiences anxiety and avoidance as a result of that to not be diagnosable with social phobia. However, a person with PDD might have developed social phobia symptoms due to the same mechanism(s) as someone without PDD; they cannot properly determine this.