1. A computer-implemented method comprising: performing a search using a search engine to generate search results, the search results including a uniform resource locator (URL); performing server-side cloaking based at least in part on the URL, the server-side cloaking comprising: accessing, by a processor, a first web page from the URL by clicking the URL included in the search results, the first web page containing spam content; accessing, by the processor, a second web page from the URL without clicking the URL included in the search results, the second web page containing non-spam content; comparing, by the processor, the first web page and the second web page; and identifying, based at least on the comparing, the URL as a suspected spam URL based on a difference between the first web page and the second web page.