Hidden text and links
 

Hidden text and links: the hidden by means of a web page is placed on many of the text and links, visitors can't see hidden text and search engines can take to climb, so as to deceive search engine for web keywords judgment. These measures include:

The text and links of the color Settings and as background
The text after piling up in pictures
Using CSS hidden text, such as: font size set to 0
Through the CSS hidden links, such as: link to 1 pixel
The link hidden in the small character, such as: a comma, etc