9. The computer-implemented method of claim 7 , further comprising organizing, by a configurator operated by the computer system, the other content items into a directed acyclic graph of sub-collections to facilitate searching the other content items using the search expression to generate a search result containing selected ones of the other content items considered relevant to the content item, to facilitate the evaluation.
7. A computer-implemented method for evaluating or facilitating evaluating of a content item, comprising: receiving, by a search expression generator operated by a computer system, the content item, as part of evaluating or facilitating evaluating of probable effect of publication of the content item, wherein the content item is a selected one of a web page, a post to a social networking site, a post to a blog, a post to an online bulletin board, a document, or an electronic message, having text divisible into a plurality of sub-texts; and generating a search expression, by the search expression generator, based on the content item, to facilitate evaluating the content item based at least in part on searching other content items through execution of the search expression, wherein the search expression includes a hierarchy of nested juxtaposition sub-expressions wherein nesting of the sub-expressions corresponds with nesting of sub-texts of the content item; wherein generating comprises recursively dividing text of the content items into subtexts, and transforming the subtexts into the search sub-expressions; and wherein generating further includes inserting instances of a juxtaposition operator between sequence elements, and between sibling parenthesized expressions within a parenthesization hierarchy, during the recursive division; wherein the search expression is to be applied by a search engine operated on the same or a different computer system, to other content items to generate a search result to facilitate the evaluating of the content item.