The **Panda Algorithm** (Google Panda) is a search engine algorithm introduced by Google in 2011 aimed at combating spam websites. Its primary goal is to reduce the rankings of low-quality content websites and serves as one of Google's standards for evaluating webpage quality.
### Maximize the following:
- Add "official" symbols such as TM, etc., where applicable.
- Maintain updated **SITEMAP**, **ROBOTS.TXT**, contact pages, FAQ pages, reference pages, and industry-standard certifications. For example, include content like "opportunities for foam glass," "how glass wool applies to high-temperature environments," and professional credentials.
- Include phrases like "recently updated" in titles and body text, with dates (e.g., 2012).
- **QDF**: If your site has news value, update it daily or even hourly.
- Tailor currency, measurements, and language to your target market.
- Have 50% more pages than competitors.
- Use an older domain than competitors.
- Extend your domain registration period as much as possible with your registrar.
- Create an overall impression of being useful, forward-thinking, clear, authoritative, trustworthy, official, and branded.
- Ensure user interfaces/plugins/videos/games/images/charts are creative and memorable.
- Design should be well-thought-out (even stunning).
- Content should be forward-thinking, sincere, witty, relevant, interesting, and professional.
- Clearly label all "ads": link destinations, promotions, and website summaries.
- Allow users to complete actions if targeting behavioral searches.
- For "buy something" searches, Google prefers sites with shopping carts that provide customer reviews, ratings, and options over sites filled with lengthy promotional information.
- Use exact match search queries cautiously: place exact match search query characters in either the URL or title tag (not both). Use partial matches elsewhere, including in the body and links.
- At least 60% of links should come from leaving comment-type or viral links on other sites related to your topic.
- 30% of links should point to the homepage, while 70% should be "deep links" pointing to important, frequently visited pages.
- Obtain links from industry-related authority sites, non-profits, foundations, credentialing boards, and non-open-registration educational and government sites or review sites. Display all medals or certificates if possible.
- At least 20% of links should be nofollow.
- Use short, readable sentences (less than 8 words) as anchor texts that partially match user search keywords.
- Keep duplicate anchor texts below 30%.
### Per Page Metrics:
- Each page should have 50% more visits per user than competitors.
- Traffic should exceed competitors by 50%.
- Google+ shares should exceed competitors by 50%.
### Minimize the following:
- Domain names should not exceed 4 words.
- Avoid more than two hyphens in domain names.
- Avoid domain suffixes other than .com, .org, .net.
#### Keyword Overuse:
- Avoid precise keyword repetitions:
- Exact keywords appearing in both title and URL.
- Exact keyword repetition exceeding 2%.
- More than 6 keywords in META tags.
#### Link Spam:
- Avoid rapid spikes in backlinks (more than 50x average growth).
- Avoid truncated PR: more than 40% of links in the first directory level.
- Avoid automatic links: more than 40% of links from open directories or websites.
- Avoid poor link placement: more than 40% of links in footers, side navigation, comments, or link pages.
- Avoid excessive reciprocal linking: more than 30% of reciprocal links on first or second-tier pages.
- Avoid excessive same-origin backlinks: more than 50% of links coming from the same domain suffix (e.g., more than 50% from .com, or more than 50% from .net).
- Avoid public sites linking to unrelated private sites: more than 2% of .edu or .gov links pointing to irrelevant content.
- Avoid having 3-5 times more backlinks than competitors.
#### Content Issues:
- Avoid plagiarized content exceeding 40%.
- Bounce rate should not exceed 50% on average.
- Average visit duration should not be less than 40% of competitors.
- Average pages per visit should not be less than 1.5.
- Text-to-advertising ratio should be less than 50% for areas wider than 700px.
- Copied content should not exceed 40%.
- Avoid more Blocks in SERP "Block" selections than competitors by more than 50%.
- Domains younger than one year face stricter scrutiny.
- Avoid spammy content: grammar/spelling errors and keyword density higher than 25%.
### Absolutely Do Not:
- Be marked as "spam," "malicious," "counterfeit," "pornographic" (if not an adult site), or "useless/irrelevant."
- Have more than 30% of backlinks from penalized or devalued spam sites.
- Exceed exact-match anchor text ratios mentioned above.
- Plagiarized content should not exceed 60%.
- Average visit duration should not be less than 10 seconds.
- Bounce rate should not exceed 80% (average for SERP index or entire site).
- Avoid technical spam pages: excessive keywords, hidden text, bridge pages, redirects, cloaking (different content for bots vs. users).
- Website loading time should not exceed 10 seconds on average.
- Avoid excessive 404 error pages.
Tags: **Google**, **Website Optimization**, **SEO**
[Link](http://www.suolatu.cn/seo/google-panda.html)