"The cost of content creation is extremely low, and Snapchat makes it fun to think about what aspects of what I’m doing every day might be cool for other people to see." But what is the reward of content creation? Honest question. How do a user feel their effort in posting was worthy? I never used Snapchat, so I don't get it much. Although I'm for sure not dismissive as some, I just never tried it.
The reward are those random bits of validation you get from friends that say to you in real life "I loved your Snap the other day" and when your friends directly respond on snapchat
That ocasional and random reward that make something addictive (like what keep you checking your email all the time, at last receiving that one useful/interesting email in the middle of several useless one). Contrasting to predictable Facebook likes that are measured solely by quantity.
I end with the impression that is a more genuine connection than the commoditized "FB like" and more personal than the "Retweet" and "FB share" that are performed by people you don't even know.