WTF is a snapchat filter?
I had to look it up:
From http://www.wikihow.com/Get-Effects-on-Snapchat
Snapchat is a popular social networking and messaging app for both iOS and Android, and you can add various effects to your photos and videos using the app. To get effects on Snapchat, you might consider using lenses (i.e. face effects), applying filters, trying the face-swapping feature, adding typed text, decorating with stickers or emoji, or using the drawing feature.
Best way to understand Snapchat’s geofilters is to think of a background template that you can then apply your own pictures too.
For example, if you are visiting Hawaii, you might want to have a background graphic telling everybody where you are.