Yahoo 'to buy Tumblr for $1.1bn'
Yahoo's board has approved a deal to buy New York-based blogging service Tumblr for $1.1bn (£725m), US media reports say.
The acquisition is expected to be announce later.
If confirmed, it will be CEO Marissa Mayer's largest deal since taking the helm of Yahoo in July 2012.
Michelle Fleury reports.