Of course, as mentioned, breaking out the true figure is close to impossible.
Citing two sources, Efrati said gross revenue for Google from YouTube was $3.5 billion in 2013. After payments to partners, net revenue was only $1.5 billion. Efrati said YouTube is profitable.
Google never breaks out revenue figures for YouTube, so we're left to rely on estimates and reports.
The $3.5 billion is significantly behind forecasts. eMarketer thought YouTube would do $5.6 billion in gross revenue in 2013. In 2012, Citi analyst Mark Mahaney predicted $3.6 billion in gross revenue, and $2.4 billion in net revenue.