I'd use "social rapport". check this out on Google.
Example:http://socialanxietydisorder.about.com/ ... apport.htm
"Social rapport is the art of building a sense of trust and respect with another person. Although some people are intuitively good at building social rapport, it is a skill that can be developed. When you have rapport with someone, you feel a connection and understanding; a feeling of being on the same page. Having common interests with another person makes it easier to develop rapport, however very different people can also form a bond."