1. A computing system that generates a lexicon of a social network, the computing system comprising: a processor; and memory storing instructions that, when executed by the processor, provide: a lexicon generator that: for respective messages of the social network: identifies a context of the message, scans the message to identify a set of word sequences, and counts an occurrence of the respective word sequences among the messages within the context; for respective contexts, generates a lexicon for the context that comprises the word sequences identified in the messages with a higher count than a word sequence count threshold; identifies a selected word sequence by which at least one user of the social network who is associated with the selected word sequence is identifiable; and refrains from including the selected word sequence from the lexicon; and a lexicon presenter that, responsive to a selection by a user of a selected context, presents to the user the lexicon of word sequences for the selected context.