Social interaction is like performing in a movie scene. You think of your environment you are in as your movie scene and you perform in it.

Now what should you do in an unknown place and don't know how to behave socially (script-less shall we say)?

Watching a movie, notice how life always seems so much more engaging with the exaggeration Hollywood place on it?

Let's give credits to some of those talented screenwriters.

Seems like screenwriters know a lot about social dynamics interaction, social psychology, human behavior and how people act and how the other person will react in response to that stimulus.

Learning the structures and how to write screenplays can help you understand a lot about human interactions and pick up a lot of clever witty-lines and well-polished human responses you will only encounter in movies because of the time taken to write them,

Watch some great movies that are not too out there where the character can actually be an everyday real person, and notice how he responds to other people and the world.

Want to learn how to be funny? Watch comedy shows, typically sit-coms, and take note where the parts that made you laugh, ask yourself "why?" "what was it?". Study the structures that went behind the humor, and imitate it in the real world.

And as much as we all hate them, you can learn a lot from watching reality shows. I don't mean those lame game shows where the government taxes almost all your winning money, but where people are constantly interacting with each other, and be aware of the change of the dynamics when alliances are built and backstabbers come out; take notes of those kinds of people and what motivates them and their personality. This will help you understand the patterns of those people's sub-behaviors, behaviors under the radar, to either avoid or handle those people in the real world.

Getting involved in theater and acting, especially improvisation, which I can't recommend enough are the most valuable things you can get involved in. They can help you a lot to help improve your social performance whenever you out in social gatherings.

Keep in mind you are an all-around actor, and whichever surroundings you're in, become that ideal character for it who will handle it effectively.