Using SlideOnline you can upload and Share presentations online with a few clicks. First, you will need to create a free account. Then, go to the upload page and drag and drop the presentation from your computer. The upload progress will start and you will need to wait until the conversion takes place before you can chare powerpoint presentations online.
You can also embed powerpoint into your websites including Facebook, WordPress blogs and embed powerpoint into Tumblr. It is a good alternative to other online services including AuthorStream or even powerpoint Web Apps.