Samaritans Twitter app alerts users when friends struggling to cope

A web application is being launched that monitors your Twitter feed for signs that friends may be struggling to cope.

Samaritans Radar looks for specific words or phrases and alerts users if a Tweet in their feed is worrying. The app then offers guidance on the best ways to reach out and offer support.

The BBC's Rory Cellan-Jones looks at the new app from Samaritans.