The ads will run on TV and online and in other media in the U.S. and nine other countries.
The campaign is an effort to reinvigorate the brand-whic was once the Twitter-and-Facebook of its day.
Yahoo's new Chief Executive Carol Bartz reportedly believes the company has been getting a bum rap — something she hopes to reverse with the new advertising push.
"When you get outside of New York City and Silicon Valley, everybody loves Yahoo," Bartz said Tuesday during a press conference that was webcast. "Why are you (the media) so cynical about us? Be cynical about frigging Google. If you don't love us, leave us alone."