SPAM Domains

[Lidador]

Common features of spam domains include:

• Long domain names
  .info, .cc, .us and other cheap, easy to grab TLDs
  Short registration period (1 year, maybe 2)
  High ratio of ad blocks to content
  Javascript redirects from initial landing pages
  Use of common, high-commercial value spam keywords like "mortgage," "poker," "texas hold 'em," "porn," "student credit cards," and related terms
  Many links to other low quality, spam sites
  Few links to high quality, trusted sites
  High keyword frequencies and keyword densities
  Small amounts of unique content
  Very few direct visits
  Very few links sent out in (non-spam) email to the site
  Registered to people/entities not associated with trusted sites
  Not frequently registered with services like Yahoo! Site Explorer, Google Webmaster Central or Live Webmaster Tools
  Rarely have short, high value domain names
  Often contain many keyword-stuffed subdomains
  More likely to have longer domain names
  More likely to contain multiple hyphens in the domain name
  Less likely to have links from trusted sources
  Less likely to have SSL Security certificates
  Less likely to be in directories like DMOZ, Yahoo!, Librarian's Internet Index, etc.
  Unlikely to have any significant quantity of branded searches
  Unlikely to be bookmarked in services like My Yahoo!, Del.icio.us, Faves.com, etc.
  Unilkely to get featured in social voting sites like Digg, Reddit, Yahoo! Buzz, StumbleUpon, etc.
  Unlikely to have channels on YouTube, communities on Facebook or links from Wikipedia
  Unlikely to be mentioned on major news sites (either with or without link attribution)
  Unlikely to register with Google/Yahoo!/MSN Local Services
  Unlikely to have a legitimate physical address/phone number on the website
  Likely to have the domain associated with emails on blacklists
  Often contain a large number of snippets of "duplicate" content found elsewhere on the web
  Unlikely to contain unique content in the form of PDFs, PPTs, XLSs, DOCs, etc.
  Frequently feature commercially focused content
  Many levels of links away from highly trusted websites
  Rarely contain privacy policy and copyright notice pages
  Rarely listed in Better Business Bureau's Online Directory
  Rarely contains high grade level text content (as measured by metrics like Fleisch-Kincaid Reading Level)
  Rarely have small snippets of text quoted on other websites and pages
  Cloaking based on user-agent or IP address is common
  Rarely contain paid analytics tracking software
  Rarely have online or offline marketing campaigns
  Rarely have affilliate link programs pointing to them
  Less likely to have .com or .org extensions
  Almost never have .mil, .edu or .gov extensions
  Rarely have links from domains with .edu or .gov extensions
  Almost never have links from domains with .mil extensions
  Rarely receive high quantities of monthly visits
  Rarely have visits lasting longer than 30 seconds
  Rarely have visitors bookmarking their domains in the browser
  Unlikely to buy significant quantities of PPC ad traffic
  Rarely have banner ad media buys
  Likely to have links to a significant portion of the sites and pages that link to them
  Extremely unlikely to be mentioned or linked-to in scientific research papers
  Unlikely to use expensive web technologies (Microsoft Server & Coding Products that Require a Licensing Fee)
  Likely to be registered by parties who own a very large number of domains
  Unlikely to attract significant return traffic
  More likely to contain malware, viruses or spyware (or any automated downloads)

Source: http://www.seomoz.org/blog/separatin...re-the-metrics