Ubuntu keeps creating dummy directories

Whenever I boot into Ubuntu, something (frankly, I'm not sure which program does that) creates a bunch of directories, namely ~/Music, ~/Videos, ~/Documents, and ~/Audiobooks.

I know it's possible to change the names of these directories with ubuntu-tweak, but I don't want these directories in the first place...

How do I prevent Ubuntu, or whatever program is responsible for the creation of these Directories, from creating them?

Go to System → Preferences → Startup Application and disable "User folder update".

You can also use UbuntuTweak to set them to arbitrary directories.