Yahoo Japan, the country's largest Web portal, said up to 22 million user IDs may have been leaked during a hack that was discovered last week.
Yahoo's board of directors has approved spending $1.1 billion in cash to buy popular blogging site Tumblr, according to The Wall Street Journal.
Yahoo has called a mystery press event in New York City on Monday afternoon, hot on the heels of rumors that it plans to buy Tumblr for US$1 billion.
Rumors are swirling that Yahoo is really, really interested in buying Tumblr to appeal to teens.
An appeals court in Mexico has overturned an approximately US$2.7 billion judgment against Yahoo and Yahoo Mexico in a breach-of-contract suit concerning online directories.
With 63 percent of businesses now supporting telecommuting, CEO Marissa Mayer digs in on her controversial ban against working from home.
Yahoo has acquired a mobile gaming company, Loki Studios, taking its total acquisitions this month to four.
Microsoft has extended a search revenue guarantee agreement with Yahoo for one more year, amid reports that the Internet company is trying to break its 10-year agreement with Microsoft.
Yahoo's Flickr mobile app may be getting a completely new look in the months to come, as the company seeks to hire multiple iOS engineers to "radically improve" the photo-sharing site's app and attract new users.