Too late for a real answer. In brief, and in order:

Sort of.

Yes, but not without introducing different social problems.

All software (necessarily) has an embedded social model.

It depends.

Are blogs a technological solution to a social problem (that of communicating ideas with others)? Is not the existence of “social software” in and of itself evidence that some social problems can be solved or lessened by technology?

Also you say “In order to allow people to be social protocol negotiating machines, good software should give people the information they need to perform social negotiations”. But doesn’t that imply that the software needs some kind of social model (i.e., so that the software can decide what information to present to the user at any given moment)? Or do you mean software should merely present some kind of query interface to allow the person to retrieve the required information?