1. A computer-implemented method comprising: receiving first text submitted by a first user; for each of a plurality of different previously submitted texts, calculating a text similarity score based on a textual similarity of the first text to the previously submitted text, and calculating a sentiment similarity score based on a similarity between sentiment of the first text and sentiment of the previously submitted text; based on the scores, selecting one or more of the previously submitted texts having closest similarity to the first text; for each of the selected texts, identifying an emoticon previously selected by a user for insertion into the selected text; and providing the identified emoticons for selection by the first user.