What are the hidden methods of spam?

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Let's look at examples of hidden spam.

Hiding content
When viewing a page, the browser may not see keywords or links that contain search spam. Very often, content is hidden using certain color schemes. For example, phrases in the body of an HTML document are not visible if their color matches the background of the page. A simple example:

<fontcolor="white">hiddentext</font>

Search spam can be hidden this way if you avoid marketing list of senior homes text anchors. Instead, spammers often create a very small, 1x1 pixel anchor image, also invisible to the visitor, or the same color as the background.

In addition, a spammer may use scripts to hide some visual elements on a page, such as setting a visible HTML style attribute to the wrong one.

Masking (cloaking)
If spammers can easily determine the IP address of a network spider (robot), they can use a method called cloaking. The client (in this case, the IP address from which the spider (robot) comes) indexes the pages.

Web servers that contain search engine spam return a special HTML document to a standard web browser, while they return a completely different document to a spider. This means that spammers can offer deliberate content to users (without any signs of spam on the page) and still send a document containing search engine spam to a search engine for indexing.

There are two ways to recognize a crawler. First, some spammers keep a list of IP addresses that search engines use and identify the search engines by comparing them to the IP. Second, the server can set up a hit that makes a request for a document based on the user-agent field in the HTTP request body. For example, the following simple HTTP request message for the user-agent name is the name that Internet Explorer 6 uses: