What is Google, an advertising firm or a search firm?

What does it mean that Google is a publicly traded company, competing with rivals Yahoo! and Microsoft?

If certain searchable information becomes threatening to Google, couldn't Google easily block and/or erase very controversial or "socially threatening" sites from its servers that it doesn't want the world to seethat is, Web sites that some might deem threatening to the social order (e.g., sites with instructions on how to make weapons, sites with information on notoriously reclusive yet very powerful people or groups)?

Even if Google doesn't block controversial search results, couldn't the company just as easily bury these pages (e.g., on the ten thousandth page of results that obviously no one will ever reach), thus keeping them extremely low in the results even if they contain highly relevant and useful information?

Does Google privilege mainstream information over controversial information? If so, how?

Does "Googleization" cause reason for worry?

Does Google's "undisputed" preeminence on the Internet threaten the free flow of information?

• does it considered an "information have"? Or an "information-have not?"