Most Helpful Guy
It's meant for sexting, but for some fucking stupid reason people use it to message each other, with an obligatory picture. I hate it. I don't wanna have to ask for Snapchat and phone number and follow on Twitter and addd on Facebook and follow on Instagram.
Most Helpful Girl
Snapchat can be used to communicate with people you already know (like friends, crushes, significant others, and family members). If someone in your contacts has a snapchat, you're able to add them instantly. You can use it to casually talk, or to flirt.
You take a selfie (or picture of something) and add in a relevant caption. You can make your picture stay up for way longer than 3 seconds.