To try to be sure there is not a problem with your FB or YT accounts... share to a file, and upload the file manually
Lots of questions, but let us start with:
1. How many times and on how many different days did you try for the uploads? Try again.
2. Are you having problems with your Internet connection?
3. When you expand Publish+Share/Online/YouTube or Facebook, do you see all the presets for that choice?
4. If you export your Timeline content to a file saved to the computer hard drive and then upload that file to YouTube at the YouTube web site, is the Timeline content uploaded there successfully and viewed successfully after YouTube processing?
5. Have you checked out Premiere Elements 11 Edit Menu/Preferences/Web Sharing?
Please review the above. We will be watching for your results.