Louis Harboe makes some good points about Snapchat and how it continues to change and attract users:
You see, there are lots of messaging apps out there. So many that it’s almost like there’s a template now for these sort of things. Because popular messaging apps all implement the same features: texting, video calling, stickers. But Snapchat continues to impress me in the ways it adds small, entertaining, irregularities to conventional communication methods. Snapchat’s implementation of these template features go beyond exception. They are seemingly familiar but undoubtedly unique.
Admittedly, I don't use Snapchat a lot. But I find it remarkable how, in less than two years, Snapchat went from being a barely known app here in Italy to a full-blown phenomenon that is used by virtually all of my friends and is constantly mentioned on TV (the "Follow us on Twitter/Instagram/Snapchat" type of mention). I wish I had paid more attention.