no but they are representative of their primary demographic. Your personal experience means a lot less than the two biggest sites used by snapchat's target demographic.

And your unsubstantiated statements mean more..?

how is it unsubstantiated ? reddit has subteddits dedicated to sharing snapchats you can see subscriber numbers 4 Chan is a little harder to measure but the fact the threats are brought up several times a day days a lot

Some reddit users are snapchat users != most (or even a substantial minority!) of snapchat users are reddit users.

Statistics 101.