We’ve published almost 50 articles in our long-term special series on the impact of social media on society, looking at the latest research in that rapidly moving field. One of the most recent took in interviews with teenagers and detailed some of the digital issues dominating their lives as they navigate platforms and networks. It’s important work, and well worth spending some time reading. We’ve also run a live event as part of the series and in the new year hope to produce some audio linked to it.

This week’s podcast, meanwhile, considers potatoes. China is the largest potato planting country in the world and yet traditionally potatoes are seen as a vegetable in Chinese cuisine, rather than a staple. But in 2015 the government decided to try and change that, introducing the tuber as the country’s fourth staple alongside rice, wheat and maize in an effort to improve food security. In the latest episode of The Conversation Weekly we find out why pressures on the global food system, combined with climate change are focusing minds on the need to shift national diets. Follow wherever you usually listen to your podcasts.

Gemma Ware

Editor and Co-Host, The Conversation Weekly Podcast

timelineguru/Shutterstock

Online safety: what young people really think about social media, big tech regulation and adults ‘overreacting’

Emily Setty, University of Surrey

Most young people regard reining in the big social media platforms as only part of the solution to the ‘relentless stream’ of abuse and shaming they experience online

China began promoting potatoes as a staple in 2015 in an effort to combat food insecurity. chinahbzyg via Shutterstock

China wants more people to eat potatoes – how changing national diets could help fix our global food crisis. Podcast

Gemma Ware, The Conversation; Daniel Merino, The Conversation

Why countries need to shift what their citizens eat, and what the optimum diet for our planet might be. Listen to The Conversation Weekly podcast.

Descendants of the indigenous San people in the Kalahari Desert. Eric Lafforgue/Gamma-Rapho via Getty Image

When did humans first start to speak? How language evolved in Africa

George Poulos, University of South Africa

The first speech sounds were uttered about 70,000 years ago and not hundreds of thousands of years ago as is sometimes claimed.