Snapchat is a popular form of communication between members of ATF. It is like texting, but with pictures and with a time limit.
Snackchat is a weekly contest during 'Survivor' to see who is eating the best #SurvivorSnack. Entries are sent in using snapchat. The prize each week is just validation in knowing you had the best snack.
Usually involves very few phallic images. Mostly pictures of people named 'Dick'.