Methods and systems are provided for association of various online elements with emotional states. A set of emotional states may be generated or obtained, and particular online elements may be assigned to particular emotional states of the set, such as with emotional states that are reflected or represented by or in the online elements. Online elements can be of various types, such as, for example, Web sites, blogs, articles, online events, online activities, online messaging, etc. User association or interaction with online emotional state-associated online elements can be used in classifying users into particular emotional states.