Deception: Being deluded, or producing that state in someone.
Most social affairs are oriented around various kinds of deception. Not all of these are malevolent, and indeed some, like politeness and friendliness, are meant to please and are mostly in the interest of helping other people. Also, many kinds of deception are not primarily malevolent, but based on self-interest: One praises the goods one wants to sell for more money than one bought them for not to harm the buyer but to serve oneself.
In any case: What is social is to a considerable extent founded on deception, including self-deception, in as much as what is social is mostly made up of playing roles and acting as if, all of which require some degree of deception, from a very small one to a very fraudulent one.