SlidePub offers a functionality named Remote Presenter that can be used to do a presentation over the Internet.
Can I use a similar functionality using SlideShare? If so, how? I can't find it on their website.
The SlideShare online presentation feature you are looking for is called Zipcast. Zipcast has both a free version and a paid version. The paid version of Zipcast is included as a feature in the paid SlideShare PRO Account. The features of the free version of Zipcast are:
SlideShare Zipcast works in any modern browser. You can find instructions for how to start a web meeting in Zipcast by visiting the link mentioned previously which links to a slide presentation called Introducing Zipcast.