How can philosophy help med understand and learn more about social interaction?
Sorry for the delay in responding...1st email notice went to my junk folder.
When it comes to practical matters, philosophy isn't going to be very helpful. The analysis of and acquiring skill sets of Social interactions fall more directly under sociology and psychology. Once upon a time, philosophy used to deal with these topics, e.g. Aristotle's works on Psychology (De Anima). But these were works that lacked the scientific tools we have today...e.g. controlled studies, more complete understanding of human physiology.
Now if your question not about how we do in fact act, but how we ought to act, then philosophy has some answers (perhaps too many). Ethics deals with normative questions (as opposed to descriptive) that determine the difference between good/bad or right/wrong actions.
Please feel free to follow up if I have misunderstood your question.