Web spam refers to those unwanted garbage pages that use overtly deceptive search engine optimization (SEO) techniques and contain no valuable content, is a frustration to search engines and search users. Page-level web spam uses on-page SEO trickery, that webmasters and optimizers do to fool search engines to get their webpages a higher-than-deserved ranking based on their content relevancy, often times for subject areas that’re completely unrelated to site's actual content. This’s done in an effort to deceive searchers into visiting their spammy sites for a multitude of reasons, none of which usually benefit end user. Use of following questionable SEO techniques will cause Bing to examine your site more deeply for page-level web spam. If your site’s determined to be using web spam techniques, your site could be penalized as a result:
- Keyword URL and link stuffing: use of heavily repeated keywords and phrases for attaining a more favorable ranking for those words in a search engine index.
- Misspelling and computer generated words: Pages populated with many various spellings of targeted keywords, especially those unrelated to theme of the page or the site, can indicate that keyword lists’re computer generated.
- Redirecting and cloaking: when a client visits, certain traits can be used to identify the user and redirect them to a different page. These include, but aren't limited to, redirects based on referral code, user agent (bot or human), and IP address.
More info: Bing blog