One of the biggest problems with being an artist online is that people can easily take your art and post it themselves. Usually they do this without credit, gaining a following for themselves while the person who put the effort in remains unacknowledged.
Waterfall helps defend against this with the Art post type.
The Art Theft System
In short, Art posts are a special type of post that tells the servers to run some complicated math on the images you upload. The specifics are a secret, but the end result is a database of all the art uploaded on the site, and the server can check any new uploads against the database. The system is constantly being iterated on based on feedback and testing, as well as available resources.
If someone tries to upload art that's already been uploaded by you, their post attempt fails - instead, it automatically converts into a reblog of the original post you made with that piece.
Additionally, art posts also have a special flag set to make sure that a full size, high quality version of the image is always available for viewing.
Using art posts isn't mandatory for your art, but it is highly recommended.
Which post type should I use?
Which post type to use in a given circumstancee depends on a few factors.
Use Art posts if...
- It's a finished piece
- The content is completely original (drawing other people's OCs with permission is OK!)
Use Image posts if...
- It's a meme
- It's not art
- There's content you didn't make, such as screenshots from TV shows, tweets etc
- It's text heavy
- It's heavy on unused space
In short, Art posts are to showcase and protect the work that went into something. Image posts are for everything else.