Vine users upload 1 million videos a day:

http://www.latimes.com/business/la-fi-vine-20130620,0,2724646.story

Instagram had five times that on its very first day. 

Vine allows embeds. Instagram does not.

"Instagram, it turns out, shares in … not out. In other words, you can view the video within the Instagram app, or — if you have the URL — on the Instagram website. You can also view the video in Facebook, but nowhere else. Sure, you can enable sharing via Twitter, but that’s just a link to the Instagram website (thanks to Twitter and Instagram’s little spat last year."

Source: http://venturebeat.com/2013/06/21/vine-vs-instagram-if-you-want-to-share-videos-everywhere-choose-vine/

Why Instagram videos are 15 seconds long: So brands can put ads in them.

Source: http://venturebeat.com/2013/06/21/why-instagrams-videos-are-15-seconds-long/

Why I will never click on an Instagram video, by Mathew Ingram:

http://gigaom.com/2013/06/20/why-i-will-never-click-on-your-instagram-video-no-matter-how-much-you-want-me-to/

The first Instagram video with a million likes: shirtless Justin Bieber.

http://mashable.com/2013/06/22/bieber-instagram-video/