that's actually a great question! so when someone adds you on snapchat or you add them, the first thing they see are two things. 1. your username 2. your snapchat score. so its basically how popular you are on snapchat. how many snapchats you send and receive and whether you are active or not. much like what followers are to instagram accounts or what subs are to twitch streamers, only its a score. I hope this answers your question
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