With the help of this Spam technique
not the searchers but only the search engines
can view some part of the data in a web resource
(e.g. the of a HTML document).
Some commonly used content Spam
techniques are as follows:
Using fonts that are the same
or similar color as the background to hide keywords
is one of the most common search engine spam
techniques. This can be done by using tables
or a background with a different color than
the real background for the site.
b) Keyword stuffing
Another very popular search
engine spam trick, used along with hidden text,
is the repetition of keywords on the bottom
of the page in very small fonts.
In order to manipulate a search
engine's relevancy calculations, Meta data (which
actually describes a web resource) describes
a web resource inaccurately or incoherently.
Following are the common Meta
In order to fool searchers it
has become a common technique to use popular
keywords that do not apply to the site's content.
For the time being one may be able to trick
a few people searching for such words into clicking
at the link, but soon they will leave the site
when they will not get any relevant information
on the topic they were originally searching
for. This kind of search engine spam upsets
both the search engines and their users.
b) Hidden tags
The use of keywords in hidden
HTML tags like title tags (For example: ), comment
tags, Meta description tags (for example: ),
style tags, http-equiv tags, hidden value tags,
alt tags, font tags, author tags, option tags,
and no frames tags (on sites not using frames)
are considered as search engine spam by some
search engines while others may allow it.
Duplicate web page (or doorway
page) are considered as search engine spam by
all search engines and directories. It is not
advisable to give the copies different file
names, and submit them all (mirror pages). This
will be interpreted as an attempt to flood the
& switch" technique)
This means optimizing a page
for high search engine position, and then swapping
another page in its place once a top rank is
achieved. This technique does not lead to a
long-lasting search engine placement.
Redirecting is defined as taking
a searcher from a page designed only for a search
engine to see to a page designed for the searchers
by using META refresh tags, CGI scripts, Java,
is considered as spam.
Spam filled web pages are intended
for the search engines only. When visitor visits
those pages, they are redirected to the real
page. Generally search engines do not like pages
that take the user to another page without his
or her intervention.
Link spamming is the technique
of artificially increasing the link popularity
of a web site in order to influence its ranking
in the search engines.
The common factors of link popularity
>> the number of inbound
links a web site has,
>> the link popularity of the sites linking
to that web site,
>> the context of the sites which are
linking to the web site, and
>> the similarity with the linking site.
The last three factors are difficult to influence,
but web masters still try link-spamming techniques.
Some common techniques are described
Posting messages to various
message boards and guest books is a very common
practice that a web masters implement. They
visit hundreds of them and post messages with
links to their sites. Search engines are sophisticated
software’s and are easily able to detect
this sort of spam.
In guest books and message boards,
many messages are posted every day. It means
that apart from linking to your site they are
linking to numerous other web sites. So the
number of their outbound links is numerous,
this reduces the importance of those links.
If there is a web site that has got only two
outbound links and it is linking to your site,
that link is more important as compared to a
link from a site, which has got 200 outbound
Though the definition of link
popularity says that it is the number of web
sites linking to a web site, still it is not
the number but the quality of the links that
matters. Quality of the links means the context
of the links as well the link popularity of
the sites, which are linking, to that web site.
However, it is very difficult to artificially
get quality links.
Another common method by which
spammers try to influence the link popularity
of web sites is by joining link farms. A link
farm is a network of web pages, which are heavily
cross-linked with each other. Those web pages
are present may be in more than one domain or
in more than one server. In order to influence
the link popularity, when a web site joins such
link farms, it gets a link from each of these
pages and in turn it also has to link back to
each of those pages. But search engines can
detect the link farms as well as the web sites
participating in the link farms very easily.