Vine is a free app for sharing short, looping videos for iPhone or Android.
The number of links to Vine videos on social networks fell by nearly half a million the day after video was added to Instagram's photo app on 20 June.
Twitter launched its video-sharing platform in January 2013. Users are able to upload and share six-second long clips which play in a loop.
Videos shared via Facebook-owned Instagram can be up to 15 seconds long and filters can be added to change the colouring.