A whopping $6.5 billion was spent in 2016 on Facebook Ads and $2.5 billion on Instagram Ads. That is a combined $17.5 billion spend for 2016. Snapchat is also starting to make waves and is also worth $3 billion per year.
Facebook Ads are the most widely used advertising channel across the world. This is also because of their massive reach and the ability to reach millions of people at the same time. Facebook is by far the biggest advertising platform and it is also the most profitable channel.
In 2014, Facebook reported that $1.67 billion was spent on Facebook Ads. It's grown much larger since that time. However, the total amount spent on Facebook properties overall, including Snapchat and Instagram, is much higher.