How much of a difference do nine seconds make?
That's the difference between the six-second looping videos you can post on Twitter's Vine app and the new 15-second videos you can post on Facebook's Instagram.
Here's my take: Nine seconds is suddenly a really long time. More time to fill with exciting, creative clips or breaking news. Or nine more seconds of vacuous shots showing cats jumping, toddlers tripping, people displaying the food they're about to eat.
Don't believe me?
Here's my Vine video, which makes even six seconds boring.
And here's my first 15-second video on Instagram … an eternity.
—By CNBC's Jane Wells. Follow her on Twitter: @janewells