Compile a comparison study of at least four of the many search engines that we have available for use.

There is a need for more study in the areas of cloud computing and social networking weblogs.

The invisible web, also known as the deep web or hidden web, refers to the vast portion of the internet that is not indexed by traditional search engines. It encompasses various types of content that are not easily accessible through standard search queries. The size of the invisible web is difficult to ascertain precisely due to its dynamic and constantly evolving nature. However, estimates?