Yahoo's rise in Asia offsets risk from Tumblr bet

May 21 2013 11:28AM EST | Source: REUTERS Technology

SAN FRANCISCO (Reuters) - Yahoo Inc Chief Executive Marissa Mayer's $1.1 billion acquisition of blogging service Tumblr will be a test of her ability to revive the aging Web portal. Luckily for her, her performance may be graded generously.