what does s mean on snapchat?

best answer
It turns out the ‘S’ on the snap stands for ‘ Streaks ‘. Snapstreaks are Snapchat’s way of making sure you don’t forget your friends. Snapstreaks occur when two people send each other snaps for three days consecutively. The ‘S’ is used to tag a snap as a ‘Streak’ snap to distinguish it from a regular snap.