Abstract: A computing device for processing textual information from at least one source of textual information is provided. The computing device includes a processor that is a functional component of the computing device and is configured to execute instructions to process the textual information. A listener component is configured to receive the textual information from the at least one source. A context analyzer is coupled to the listener component and is configured to generate context information relative to the textual information. A content analyzer is coupled to the listener component and is configured to identify a set of n-grams from the textual information and to provide filtered content by removing at least some n-grams using a probabilistic data structure that determines if a given element is a member of a set. An indexing component is configured to index the filtered content.