in my opinion Being 22 I would add only people I Facebook I know or gone to school with etc. My Instagram is private and I follow or add whoever and my boyfriend the same I don’t mind. However I think Snapchat is a bit more private I don’t know why I wouldn’t add random people or people I don’t know well on it. I saw when beside my boyfriend he added a random girl from Instagram who lives around. I also realised she’s still in school so she must be like 17! I was kinda annoyed but haven’t brought it up I don’t know how to or don’t want to stay a huge argument. Really don’t think they’ve been snapping but still don’t like the fact he added her.