18. The method of claim 17 , wherein: scanning the respective selected message to identify a set of word sequences further comprises: determining a recency of the message; and generating the lexicon further comprises: generate a lexicon for the context that comprises the word sequences identified in the selected messages with a higher count than a word sequence count threshold and that have a recency greater than a recency threshold.
17. A method of generating a lexicon for a context of a social network, the method involving a device and comprising: executing, by the processor, instructions that cause the device to: among messages of the social network, identify selected messages that are within the context; scan the respective selected message to identify a set of word sequences; count an occurrence of the respective word sequences among the selected messages within the context; generate a lexicon for the context that comprises the word sequences identified in the selected messages with a higher count than a word sequence count threshold; identify 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 refrain from including the selected word sequence in the lexicon; and responsive to a request by the user to present word sequences that frequently occur in the context, present to the user the lexicon of word sequences for the context.