Google On-Site WebSpam Factors
2. Links to Bad Neighborhoods: Linking out to “bad neighborhoods” — like pharmacy or payday loan sites — may hurt your search visibility.
3. Redirects: Sneaky redirects is a big no-no. If caught, it can get a site not just penalized, but de-indexed.
4. Popups or Distracting Ads: The official Google Rater Guidelines Document says that popups and distracting ads is a sign of a low-quality site.
5. Site Over-Optimization: Includes on-page factors like keyword stuffing, header tag stuffing, excessive keyword decoration.
6. Page Over-Optimizaton: Many people report that — unlike Panda — Penguin targets individual page (and even then just for certain keywords).
7. Ads Above the Fold: The “Page Layout Algorithm” penalizes sites with lots of ads (and not much content) above the fold.
8. Hiding Affiliate Links: Going too far when trying to hide affiliate links (especially with cloaking) can bring on a penalty.
9. Affiliate Sites: It’s no secret that Google isn’t the biggest fan of affiliates. And many think that sites that monetize with affiliate links are put under extra scrutiny.
10. Autogenerated Content: Google isn’t a big fan of autogenerated content. If they suspect that your site’s pumping out computer-generated content, it could result in a penalty or de-indexing.
13. Excess PageRank Sculpting: Going too far with PageRank sculpting — by no following all outbound links or most internal links — may be a sign of gaming the system.
14. IP Address Flagged as Spam: If your server’s IP address is flagged for spam, it may hurt all of the sites on that server.
15. Meta Tag Spamming: Keyword stuffing can also happen in meta tags. If Google thinks you’re adding keywords to your meta tags to game the algo, they may hit your site with a penalty.