The Internet is a wonderful place with plenty of possibilities, every trend, concept or successful website create a sub-industry to make the first better. Being able to add to a successful trend is a very good business decision. Sometimes when the main trends disappear its helpers goes with it. However the fact they are available may help it to stay alive.
Search engines were there for a long time, but then there were many of them, and add to them all the different directories, it became a hard work. So Search engines submitters started appearing and the mission became easier.
The Web2.0 and the blogging phenomenon is an extreme example of how nested such a concept be.
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