Vine launched a week ago today, yet has still managed to swing to the top 10 free apps in the App Store, and has taken the number one spot in the Social category. But how does that measure up against other Twitter-integrated video sharing services like Socialcam, Cinemagram, Telly and Viddy? According to KeyHole analytics, Vine is twice as popular as the next biggest video-sharing app on Twitter, SocialCam, even after being removed from Apple's featured section after a slight porn incident. Almost half of the videos on Twitter in the last week came from Vine — approximately 243,000 of them, to be more specific. The next app with video links on Twitter was Socialcam, with 120,000 video links on the world's briefest social network. After that, Cinemagram and Telly are nearly tied for third and fourth place, with Viddy bringing up the rear. The most RTed Vine on the platform over the course of the week came from Liverpool FC, a happy birthday message. Vine's early success has to be partially caused by its parent company, Twitter, who has the brand recognition and user base to quickly push the app out to new users. In other words, Vine's rise to popularity and high-level of engagement makes sense one week out. It's a new form of content sharing and social networking. Almost none of the other services, while unique, have the ability to string various clips together into one looping video. People are excited about that, but will they remain excited? Instagram took the world by storm because it made taking, beautifying, and sharing pictures uber-simple from your mobile device. While Vine offers a more immersive form of content sharing, it also takes a bit more time and attention to create a Vine than it does to pop a picture up on Instagram. But some might say that the reward is greater. Users have much more control over their creations on Vine than they do on any of the other competing video services, as well as Instagram. Time will tell if Vine becomes the Instagram of video, but for now the Twitter-owned app is off to an excellent start.