A system and method for recommending emojis to send by a messaging application includes receiving user biosignals from at least one sensor, receiving context information from at least one context source, and selecting, using a rule-based heuristic state selector, a list of plausible user states from possible heuristic states in a heuristic state table based on the received user biosignals and received context information. A state predictor determines, from at least the list of plausible user states and a user model of emojis previously sent in different user states, a list of user states and probabilities that the user will send an emoji for each user state given the context information. The recommended emojis are displayed for selection for sending by the messaging application in order from the highest to the lowest probabilities that the user will send the recommended emojis based on a selected plausible user state.