Google is the number one search engine and number two website (to Yahoo). They help set the standard that other websites feel that they have to match. Specifically, most (if not all) of the services of Google are free, so sites like Twitter continue to provide the services at their site for free even though they have no alternative income. As a company, Google can provide its services for free because it makes gobs of money through ads.
Google has done so many things right on the Internet. Their search engine makes so many things possible. They support numerous open source software projects through their Google Summer of Code program. (I would actually like to get on a project next summer.) Google even has the motto of "Don't be evil." However, Google has done one thing that I deem as evil.
In 2005, many people were talking about book scanning projects. Many different companies, organizations, and people are trying to digitize all books. Google Book Search is the result of Google's lone efforts. Google is working alone because they do not want to share their scanned books with others, which does not sound like the Google I know and love. Google dominates because of its exceptional searching abilities. Google should not care who is holding the books; their algorithms will be what everyone uses.
Most people had problems with Google's scanning actions because they were scanning books that were still in print and copyright. The other book scanning projects are sticking to books that are out of copyright and out of print. Since the controversy, which included many class action lawsuits, Google has negotiated deals with the copyright holders in which Google can continue its work.