Noun
social lubricant (plural social lubricants)
A food, beverage, drug or activity that helps people feel more comfortable in social occasions.
Beer is considered to be a social lubricant in many societies citation citation and is consumed in countries all over the world. Source: Internet
Facebook is currently the most popular social networking site and touts many advantages to its users including serving as a social lubricant for individuals who otherwise have difficulties forming and maintaining both strong and weak ties with others. Source: Internet