It is etiquette
People Skills. Communication skills.
Unsocial, nonparticipating, aloof, antisocial, or standoffish. Those words mean lack of social skills.
another word for skills could be talents.
Anti-social
another word for social misfit is sociopath or a nonconformist
Caste is another word for social status. It means the system of dividing society into classes.
social engagment
soft skillspeople skillsinterpersonal skills
You could try abilities or skills.
Another word for this could be social media, or you could describe the particular type of platform you are being social on by using that network's given monikers, such as "Facebooking" or "Tweeting" at someone, or "Instagramming" a photo.
Another word for sharpen is improve. Example: He took a class to sharpen his skills. He took a class to improve his skills. The two example sentences mean the same thing.
Excess or abundance are other words for surplus in social studies.