[koboll]

The difference is that the copy is authorized, unless the work is being pirated.

When an artist displays their work on DeviantArt or Artstation or whatever, they are allowing the general public to load it into memory. It's part of the license agreement they sign when they sign up for these services.

[jpollock]

The copy isn't authorized, the copy is allowed under Fair Use. There's a huge difference between the two.

[koboll]

Wrong.

Fair Use applies to instances that would otherwise be copyright violations, i.e. unauthorized distribution.

When you sign up for a social media site you EXPLICITLY grant the site the rights to distribute it. You have expressly permitted it. It's a big difference!