Although live videos on Facebook bring in what appears to be big numbers, if you dig into the data you find that it is not the viewing fest that it initially seems. For instance, a client recently did a 20 minute live video stream on Facebook. It had a reach of over 10,000 people.
But when you go into the Insights you can see that only 900 people watched the video for 10 seconds or more. And half of those people never turned on the sound. This means it played automatically, but they were not really watching it. Odds are it fired off while they were looking at something else on their screen or even while they turned away from their screen.
The average video watch time was 18 seconds.