11. A computer program embedded in a non-transitory computer-readable storage medium, when executed by one or more processors, for sensitivity categorization of web pages, cause the one or more processors to perform the following operations: identifying a space of sensitive pages based on a sensitivity categorization of a first plurality of web pages and a second plurality of web pages, the first plurality of web pages being obtained from search queries using known sensitive words, the second plurality of web pages being randomly selected web pages; identifying a third plurality of web pages that includes web pages on or near a boundary between the space of sensitive pages and a space without sensitive pages; redefining the space of sensitive pages based on a sensitivity categorization model trained on the first, second, and third pluralities of web pages; determining that a given web page is sensitive when the given web page is in the space of sensitive pages; and including the given web page in a marketing operation when the given web page is determined to be not sensitive and discarding the given web page for the marketing operation otherwise.
11. A computer program embedded in a non-transitory computer-readable storage medium, when executed by one or more processors, for sensitivity categorization of web pages, cause the one or more processors to perform the following operations: identifying a space of sensitive pages based on a sensitivity categorization of a first plurality of web pages and a second plurality of web pages, the first plurality of web pages being obtained from search queries using known sensitive words, the second plurality of web pages being randomly selected web pages; identifying a third plurality of web pages that includes web pages on or near a boundary between the space of sensitive pages and a space without sensitive pages; redefining the space of sensitive pages based on a sensitivity categorization model trained on the first, second, and third pluralities of web pages; determining that a given web page is sensitive when the given web page is in the space of sensitive pages; and including the given web page in a marketing operation when the given web page is determined to be not sensitive and discarding the given web page for the marketing operation otherwise. 13. The computer program as recited in claim 11 , further including an operation for assigning weights to the web pages according to a number of visitors to each page.