What version of Premiere Elements and on what computer operating system is it running?
To which does your issue apply Facebook, Vimeo, or YouTube or to all of them?
What is the estimated file size and duration of the upload?
Where does the failure occur in the Premiere Elements built in feature, and what associated error message?
Have you tried to export your Timeline to a file saved to the computer hard drive and then upload that file to the Facebook, Vimeo, or YouTube at one of those web sites?
The answers will be in the details, so please reply with details to help us help you.