Internet advertising breaks through £4bn barrier and now accounts for one pound in every four spent.

Twitter co-founder Jack Dorsey is to return full time to lead product development, three years after he was pushed out of the company as chief executive.

Amazon has unveiled an online music service that lets users upload songs and play them from a range of devices.

Australian PM Julia Gillard's parliamentary computer and those of at least two senior ministers are suspected of being hacked, reports say.

Music-streaming service Spotify has apologised to users after advertisements containing malware were served to users.

The Times and Sunday Times had 79,000 monthly digital subscribers at the end of February, according to new figures.

Facebook removes a page calling for a new Palestinian uprising against Israel, after more than 350,000 people sign up to it.