Growth of social media ad revenue

According to a report in CNBC, social media ad revenues reached $41.5 billion in 2020. Making up nearly 20% of all internet revenue. Digital video saw
20.6% year-over-year growth, increasing its share of total internet ad revenue by 1.3% to reach 18.7% April 7, 2021. To what do you attribute the extreme
growth of social media ad revenue and digital video growth? From your perspective is it effective to achieve sales? Or not? Give an example of an
outstanding social media ad. What do you predict will be the future trend for this media channel? Please put you reflections in your journal.