Tech Tent 40: Web of hate?

"Gamergate" is a Twitter hashtag making the news this week, but what exactly is the affair about and what does it mean for women users of social media? We'll give you a full explanation of it, and hear from Brianna Wu, a female programmer who received death threats after expressing a view on it. And we also talk to two young women engineers who strike a more positive note on women's ability to voice their opinions online.

Also, how could SMS messages help to control the outbreak of Ebola in Western Africa? We speak to Robin Burton, who is working with the International Federation of Red Cross and Red Crescent societies on extending the Tera system installed in Sierra Leone to neighbouring countries. Presented by Rory Cellan-Jones, with Dave Lee from the BBC Online Technology Desk.