Which are Modern Day Black-Hat SEO technique?

Penguin has a fixed definition of what is considered a webspam or black-hat technique. Here are some of the more common tactics that Penguin flags for punishment.

• Keyword stuffing. This is when the keyword density on a page becomes so high that it could be an obstacle to the quality of the content
• Cloaking. This is when certain code is used to cause the search engine web crawler to see different content than a user sees visiting a page
• Link schemes. Creating a large network of machine-generated spam sites with the intent to link to a legitimate site, causing a huge boost to incoming links, is one possible link scheme. These schemes are considered artificial means of bypassing the current system of link exchanging for quality
• Scraped or duplicate content. Stealing content word for word, stealing and spinning content or posting multiple instances of the same content are all ways to use one piece of content multiple times, sometimes via outright theft. These are all considered webspam and are punished                                

                                       

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