When learners have the opportunity to share online with a global audience, motivation can be increased exponentially, and it is far more likely that the learner will take ownership of his or her learning. Completing assignments for an 'audience-of-one' almost never fully engages the learner!
There is an ever expanding range of options for creating and sharing multimedia presentations online.
This page lists several effective online options for creating multimedia presentations. There is a separate page for each online option. Each option is described briefly, and there is a link to it's website. There are also examples to illustrate the presentation tool in use.