The script is just the tool..You have to have a good idea to make the app go viral..when someone says Viral app, they mean an app that basically shares whatever you want when a user adds it..if you can get people to add the app and then you share something that leads back to the app and its an app that makes people want to add it then you can go viral..but there is no magically app that just works..you have to have a good idea. I actually have an app that i think will get viral..i have my advertising set, now its just finishing the app on my end..so we will see..you will be able to tell immediately if it will go viral..if you get a good starting number say 100 people to add it..and you notice its growing consistently, chances are you will go viral..Id suggest building your app in a way that can be sustained..meaning dont just push people to cpa offers..use the app to build up a facebook page or link to a website to capture users (email lists) so you can market..a couple years ago i used that javascript code that was going around to make a facebook group get to 200k before facebook shut it down..i was able to make 12k that month but after facebook shut it down, my income was done..if i had captured those 200k or a good amount, i could of used them in the future to advertise to..everyone wants money now, but think a little long term when doing this.