FWIW- I closed my MySpace account more than a year ago over the issue- They required an uploader to be installed, and didn't have a Linux version. Had the same problem with other sites as well, but none that you mentioned.
Whenever I have such an issue with a website, I contact the site maintainers, and that's the answer I got from them at that time. If anyone knows for certain that MySpace has "changed their ways", please feel free to correct me- I'd like to know, too.
Cheers