(Image source: Wired )   BY MICHELLE SCHUELKE ANCHOR MIKAH SARGENT   Social networking frenemies - Facebook and Twitter - are at it again.   On Thursday, Twitter launched the video-sharing app Vine - integrating the functions of Instagram and YouTube with all the functionality of Twitter in 6-second looping videos. However, by the end of its debut, Facebook brought down the hammer.   Facebook blocked Vine’s “find people” feature that was meant to let Vine users find and follow their Facebook friends within the application. S o what does it all mean? According to All Things D , Facebook more or less threw a wrench in Vine’s week one game plan.   “It’s basically an annoyance, a hindrance on an easy way to connect with all your existing friends using the service. It would have been a good way to jump into a new product, rather than manually trying to find all of your friends using the app.”   According to Wired , Facebook takes issue with any app using it for growth purposes and therefore Facebook’s denial is no surprise. “Facebook cutting off Vine is another way for the social giant to exert its powers. ... Facebook-connected mobile apps have much more engaged users, it’s clear that Facebook doesn’t want to give Vine the same benefits."   “Twitter recently dropped Instagram’s Twitter card integration which led to Facebook cutting off the ability to find Twitter users within the Instagram app.”   But Facebook’s response in this ongoing battle is not about smaller apps stealing their thunder - it’s about the Facebook user experience.   “For a much smaller number of apps that are using Facebook to either replicate our functionality or bootstrap their growth in a way that creates little value for people on Facebook, such as not providing users an easy way to share back to Facebook, we’ve had policies against this that we are further clarifying today.”   TechCrunch reports if Facebook really wanted to be the first to engineer new apps, it would acquire engineers or designers that wanted to be apart of start up technology instead of following others.     “If it’s going to win the best workers, Facebook has to rely on its image as a world-changing innovator that brings people closer together. It can’t do that by simply buying or cloning the next big thing. It has to amp up the futurism, and think outside the blue box it seems trapped in.”   Vine isn’t the first application Facebook has blocked.   Bloomberg says the Wonder and Voxer apps are two others blocked in the past.   No comment on the blocking yet from Twitter.