Are YouTubers artists? Thanks to the channel he started when he was a supermarket worker, Daniel Middleton is one of the most successful social-media personalities in the world.
The shy pupil who took the internet by storm
Minecraft goldmine: DanTDM's videos have had more than 18.5 billion views. Glossary
Exponentially - Exponential growth is when the rate of growth increases steadily over time, for instance by doubling: 1, 2, 4, 8 rather than 1, 2, 3, 4. This kind of growth has the capacity to lead to dramatic changes over relatively short time spans.
Depression - Low mood that affects someone's daily life, and can last for weeks or months.
Gratified - Pleased.