Yahoo agrees a deal to buy New York-based blogging service Tumblr for $1.1bn (£725m).

State-sponsored hackers are renewing their attacks on the US after a three-month hiatus, according to the New York Times.

Young children should hear about the dangers of pornography as soon as they have access to the internet, head teachers say.

Up to 22 million login names may have been stolen during a hack attack on Yahoo Japan, the web firm warns.

An IT manager who grew frustrated with call centre menus has catalogued shortcuts to thousands of phone services