14. The method of claim 1 further comprising: the submitted query and a further query among the plurality of submitted queries are submitted within a time span; and the determining of the strength score includes determining that a subset of the plurality of submitted queries is submitted during the time span.
14. The method of claim 1 further comprising: the submitted query and a further query among the plurality of submitted queries are submitted within a time span; and the determining of the strength score includes determining that a subset of the plurality of submitted queries is submitted during the time span. 16. The method of claim 14 , wherein: the subset is included in the identified one or more submitted queries and indicative of a decrease in submission of queries that correspond to the theme; and the determining of the strength score includes determining that the time span is greater than an average time span for submission of queries that correspond to the theme.