Google extended its lead in U.S. search engine usage in April for the ninth consecutive month, while its four closest competitors all lost market share, comScore Networks said Monday.Google handled 43.1 percent of searches conducted by U.S. residents in April, up from 36.5 percent in April 2005.Yahoo followed with 28 percent, down from 30.7 percent. This translates to 2.9 billion searches for Google and 1.9 billion for Yahoo, a gap that has widened consistently for the past nine months.Then came Microsoft with 12.9 percent, down from 16.1 percent, Time Warner with 6.9 percent, down from 9 percent, and IAC/InterActiveCorp’s Ask.com with 5.8 percent, down from 6.1 percent. Attracting users translates to advertising revenue for search engines such as Google and Yahoo, which serve up online ads along with search results. The search segment is the largest of the fast-growing online ad market, accounting for 41 percent of revenue. Online advertising spending grew 30 percent in 2005 to US$12.5 billion.This is why Yahoo, Microsoft and others have invested heavily on their own search engines and search-based ad networks. However, despite their efforts to strengthen their positions, Google is fending off their challenge. While it increases its dominance in the search engine space, Google is attempting to make inroads into the Web portal turf of Yahoo and Microsoft’s MSN unit by offering services such as Web mail, blogging, photo sharing, RSS reader, online calendar and instant messaging.Most of Google’s ad revenue comes from search engine-based ads, but the company has made no secrets about its plan to diversify its business into sales of display ads, such as banners, and multimedia ads, like those containing video and audio. These ads are more commonly found on Web portals.-Juan Carlos Perez, IDG News ServiceFor related CIO magazine content, check out The Enterprise Gets Googled.For related news coverage, read San Francisco to Push Google on Privacy and China Mobile, Google Talk Cell Search.Check out our CIO News Alerts and Tech Informer pages for more updated news coverage. Related content feature 10 most popular IT certifications for 2023 Certifications are a great way to show employers you have the right IT skills and specializations for the job. These 10 certs are the ones IT pros are most likely to pursue, according to data from Dice. By Sarah K. White May 26, 2023 8 mins Certifications Careers interview Stepping up to the challenge of a global conglomerate CIO role Dr. Amrut Urkude became CIO of Reliance Polyester after his company was acquired by Reliance Industries. He discusses challenges IT leaders face while transitioning from a small company to a large multinational enterprise, and how to overcome them. By Yashvendra Singh May 26, 2023 7 mins Digital Transformation Careers brandpost With the new financial year looming, now is a good time to review your Microsoft 365 licenses By Veronica Lew May 25, 2023 5 mins Lenovo news Alteryx works in generative AI for speedy analytics results OpenAI integration and AI wizardry for report generation are aimed at making Alteryx’s analytics products more accessible. By Jon Gold May 25, 2023 3 mins Analytics Podcasts Videos Resources Events SUBSCRIBE TO OUR NEWSLETTER From our editors straight to your inbox Get started by entering your email address below. Please enter a valid email address Subscribe