1) Reciprocal link request pages.
This is the link request page, if the site has a link request page, to other webmaster login their own site, to establish links.
Personally think, and can not generalize, to see this link request, whether automatically set up a link, or need webmaster audit passed after, will establish a link.
2) No Privacy Policy.
No privacy policy, obviously no privacy policy of the site, may be a personal site. If a commercial web site has no privacy policy, it is not credible.
3) outdated copyright date or last modified date visible on the pages.
The date of the copyright information is inaccurate, also shows the last edited date on the page, is not a good site.
4 error pages that don ' t send 404 headers or send content regardless of the page requested/querystring entered.
Use a regular page, or an unrelated page to replace the error page, but not return the 404 wrong file header. This action basically belongs to cheating search engines and confusing users.
5) Massive numbers of incoming links from link farms.
Huge links from the link factory.
This is obvious, link factory links Many are unrelated sites linked to each other.
6) Dead/404ing links.
Too many dead links. Such a site gives people the feeling is a site without maintenance, belong to the dead site.
7) High link churn.
The height of the link change, refers to the page code in the link to the state of change, point to the status of the page changes, very fast. A site link, very unstable, its reliability is low.
8) No published contact address, e-mail address or phone number.
The site does not have a mailing address or email, contact telephone. Such a site, can not give people a trust, unreliable.
9) A High bounce rate (surfers clicking back to their browser and selecting search result).
Quickly leave the site, users will soon click the Return button, select another search results. Such a site is likely to deceive the search engine, to get rankings, in fact, the content is completely irrelevant, users have to return to find the right site.
Too much duplicate content.
Too much duplication of content, in a site, many pages of content is repeated, such a site must not be a good site.
Whois info for the domain which are the same as other domains previously penalized or banned. (could also is true of AdSense publisher/affiliate ID ' s and other identifiable footprints)
Domain registration information is the same as the site that was previously punished. This belongs to the association, many AdSense publishers have this experience.
Use Of/links to affiliate programs that are known scams
Use or link to the well-known garbage stations. This belongs to the howl perception.
Domains previously used for spam or that are blacklisted.
Domain name has been punished before, or it was once a spam site.
) stagnation (Site never changes)
A site has not been updated for a long time, content achievements.
Excessively long URI ' s/url ' (Query strings or folder and file names)
If the site's site is too long, such as the directory name and file name are very long, it is more obvious that the search engine over the optimization.
A High percentage of affiliate links vs regular Outbound links.
Exchange links with the normal export of the proportion of the link is quite high, which is also the symptom of excessive SEO.
No/very few outbound links.
There is also a considerable suspicion that links are not or are rarely exported.
No/very Few inbound links.
No or very little import links, no other site attention to this site. The phenomenon is that the value of this site is very low.
All inbound links are to homepage only
All of the import links are very regular point to the home page, then it is possible that these links are made in a unified.
Outbound links to Questionable/spammy/crap sites.
The export links point to those junk sites that have problematic sites.
Profanity or explicitly adult language on a Non-adult site.
In non-adult sites, there are a lot of overly exposed language, which is also a bad site logo. Because the site's users from various places, all ages, if the site has adult content, then it should be separated from the parts of the non-adult content.
) Too many spelling errors.
There are too many spelling errors in the text, this problem is more easily known, it is possible that the site is not very English-speaking people do, or plagiarism, he does not have the ability to proofread.
Contains unrelated subjects (ex:a site that reviews toys and tries to sell or insurance).
The content of a site is mixed without a little connection, such as a comment on a toy site, while selling insurance or Viagra.
Lack of interest from social bookmarking sites.
There are few links from the social bookmarking site.
MySQL or PHP errors in the pages
Database or PHP error.
The above 25 points, some is about the ability of stationmaster, some is intentional, some is unintentional.
If your site has the above situation, then quickly correct it.