Last week I took a look at Instagram’s new short video feature, and waxed (somewhat) lyrical about why, in my opinion, it was no threat to Twitter’s Vine, which had rapidly expanded to 13 million users and long-eclipsed Instagram amongst shares on the Twitter network.

Turned out I might have been slightly off, at least in the near term. Since Instagram video’s June 20 launch, shares of Vine videos on Twitter have pretty much collapsed.

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