How to Easily get an S+ Survivor!

It's pretty simple on how to get an S+ survivor! However it requires Facebook!
You just have to invite or have 7 friends in game in a 70 hour period, so almost 3 days, then boom! You get an S+ Survivor! If you want to get 1 for free, sure to check out my Facebook page, Ultra Fang, which should be up shortly! Also check out my YouTube Channel, Ultra Fang Gaming, for more info!