In its first quarter earnings call Wednesday, Facebook CEO and cofounder Mark Zuckerberg revealed that the social network now serves more than four billion video views a day, 75% of which come from mobile.

One thing worth keeping in mind: Facebook defines a video “view” as watching only three seconds or more, which is a blink-and-you’ll-miss-it metric for videos that play automatically. Other platforms, such as YouTube, require users to linger much longer on a video before it counts as a “view.”

Facebook declined to spell out exactly how much advertising revenue is coming from its videos, but executives repeatedly stressed just how much marketers flock to video generally.

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