From The Atlantic's "Guide to 'Snapchat-iquette' for Millennials":

Rule # 5 of 8:

> Don’t send too many Snaps in a day, especially to a crush. You’ll look stalkerish. One panelist capped it at "5 per day." <

I remember when I was in high school, long before social media, and I used to mail 4 or 5 separate developed photographs of myself to the girl I liked, every single schoolday for a few months, until she made it clear if she was interested or not. That was the norm back then... Just kidding--I would just hand them to the girl when I saw her in class or in the hallway.

Anyway, here are the rest:

http://www.theatlantic.com/technology/archive/2014/01/how-not-to-embarrass-yourself-on-snapchat-the-millennial-guide-for-olds/283329/