Microsoft may be the only company with the means to challenge Google's Internet search dominance head on, but a number of firms are trying to compete with Google with services that tackle aspects of search that is not covered by Google's index of Web pages. Aardvark - a firm whose cofounders also include two ex-Googlers - is tackling something that it calls "social search."

This is how aardvark functions.Instead of looking at Web pages to search answers to obtain queries, Aardvark's service tracks a person's network of social contacts. Ask Aardvark for any kind of question ranging from restaurant recommendations to home enhancement tips, and the service will pass on the question to Facebook and Twitter friends who have recognized themselves as "experts" on a variety of topics.

The aardvark service, which has obtained praise from the New York Times' David Pogue and other tech bloggers, was started as a beta version earlier this year but accessing Aardvark required utilizing instant messaging software or an iPhone app.

Recently, the company put the search box directly on a website - vark.com - enabling it to become more reachable for a wide range of people.

Similar to the so-called real time search engines popularized by Twitter, Collecta and OneRiot, though presently Aardvark depicts a small segment ,it might be quite dangerous for Google in future . Most of the content that transmits through these new types of search services is not essentially reachable by Google's search engine.Google is making its efforts to tackle the situation by licensing the Twitter data feed. As more innovative forms of search evolve,Google will find itself having more such talks.