According to the Medium post;
Since 2013, millions of people have turned to Vine to laugh at loops and see creativity unfold. Today, we are sharing the news that in the coming months we’ll be discontinuing the mobile app.
So what’s gonna happen to your Vines? Nothing, according to Twitter.
Nothing is happening to the apps, website or your Vines today. We value you, your Vines, and are going to do this the right way. You’ll be able to access and download your Vines. We’ll be keeping the website online because we think it’s important to still be able to watch all the incredible Vines that have been made. You will be notified before we make any changes to the app or website.
It was not disclosed exactly they are shutting down Vine, but we would imagine is has something to do with a dwindling user base. Ever since Instagram introduced video support, Vine not only took a back-seat, but was essentially thrown in the trunk with duct tape across its mouth and hands.