Some internet advocates argue that social media companies' algorithms and monetisation schemes are destroying netizens' ability to reach their followers. How is the internet changing as a public forum and what should be done to protect it?

The new year began in Europe with predictions of a long, harsh winter and a number of countries tightening their border to control the influx of refugees. This has left many in a state of limbo, braving the elements. But it hasn't stopped the thousands fleeing violence, persecution and the search for a better life from reaching Europe's doorstep. Refugees continue to arrive by foot, over land and by sea. And for Syrian refugees and internally displaced, this begins a fifth winter, facing extreme hardship as the conflict rages on.

We'll put your questions to the UNHCR's Melissa Fleming on what lies ahead for millions of refugees. Then in the next part of the programme, we'll be joined by families hosting refugees on what it takes to resettle. How are both sides overcoming obstacles like culture and community reaction?