25. A volatile or non-volatile computer-readable storage medium that stores instructions which, when executed by one or more processors, cause the one or more processors to perform the method of claim 12 .
12. The method of claim 1 , wherein training the machine learning mechanism comprises training the machine learning mechanism based on web-based sources of information, wherein the web-based sources of information comprise at least one of: (a) information that is extracted from an analysis of search results that result from a web search query, (b) a number of trusted web sites within a specified set of search results, (c) information produced by a lexical analysis of text that corresponds to a specified set of search results, (d) and information produced from an expansion of a submission with lexical information that originates from a specified set of search results.