Google has seen its reputation as the worlds most powerful Internet firm rattled due to worry over its decreasing Internet ad sales, its major revenue source.
Media outlets including The Associated Press said Internet research firm comScore announced that Googles paid clicks, one of the portals major revenue sources, fell seven percent in January from the previous month and slightly decreased from the same period last year.
Following the announcement, Googles share price on NASDAQ fell 4.5 percent from Tuesday to close at 464.19 dollars. Reports said Googles stock has fallen a whopping 37.8 percent in three months from its annual high of 747 dollars recorded in November last year.
Institutional investors blame the U.S. economic slowdown as affecting Googles paid clicks. Other experts say Microsofts attempt to buy Yahoo!, Googles main rival, has also hurt Googles share price.
Swiss investment bank UBS lowered Googles stock price target from 650 dollars per share to 590 dollars. BMO Capital Markets cut its stock price target for Google from 690 to 590 dollars.
In contrast, Yahoo!, which has emerged as Googles competitor after Microsofts acquisition proposal, said it has tested Yahoo Buzz, an upgraded version of its Internet search program.
Yahoo! said the new system allows media outlets to determine how to link research results by themselves, and Yahoo! users to determine which content will appear on the Yahoo! homepage based on the results of polls or search frequency.