1) What years did YouTube, Twitter and Instagram launch? YouTube, Twitter and Instagram launched in 2005, 2006 and 2010 respectively. 2) What is the definition of an influencer? A person who has become well-known through use of the internet and social media, and uses their fame to endorse, promote, or generate interest in specific products, brands, etc., often for payment. 3) Give an example of an influencer and how many followers they have. Try and add some additional information, brand associations or other statistics if you can. MrBeast: 451 million subscribers on YouTube, 630.1 million subscribers across all channels; 80 million followers on Instagram; 122.7 million followers on TikTok. Brands: Feastables, Lunchly, MrBeast Burger // Partnerships: Samsung, Epic Games, Walmart, Amazon, etc. 4) How big is the influencer industry according to the article? The article states that the influencer industry is extremely large, noting that at the end of 2019, it was worth around ...