We’re all used to that five-second countdown before the skip button shows up on a YouTube pre-roll ad. Soon, you’ll have to wait just one second more and watch a full, “snack-sized’ video with the company’s new ad format. Called Bumper Ads, the short videos last just six seconds each – unlike most YouTube ads today that typically range between 15 seconds to a minute. According to Google and YouTube, Bumper Ads work best on mobile as viewers are often watching on the go, or have even shorter attention spans for what they’re trying to watch. “In early tests, Bumpers drove strong lift…

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