Hey, first post here, just wanted to say this thread has helped answer a few questions I had, so thanks for that.

I'm not sure how it's MEANT to be handled but, in our sessions we required a appropriate aspect to be invoked/tagged before a social attack could be used in a none-social situation, one that we agreed as a group would cause enough stress to actually be relevant to a fight. Whether it was one the PCs discovered about the target, or a particularly clever one added by a maneuver would depend on the situation.

For example, in the case of storm front Harry invoked a aspect involving Vics wife, so he could do a social attack.

However i'm quite happy to admit this is really more of a misunderstanding turned home brew rule, just figured I'd throw it out though.