Websites such as DeviantART and Tumblr are used as a means of sharing visual graphics. Generally DeviantART is used by artists to showcase and sell art they have created themselves; Tumblr is more a means of sharing and disseminating work created by others.
Sites such as Prezi and SlideShare are useful tools to share presentations via the internet.
Prezi is a web-based presentation creation software designed as a much more interactive alternative to PowerPoint, where you can create 'slides' within slides, zoom in and out, rotate etc. SlideShare is a means of sharing the more traditional PowerPoint presentation, by uploading to the site and them embedding your presentation within websites etc.
There are numerous photo-sharing sites online, such as Flickr and Picasa. Most use tagging systems so you can organise your work photos and find other similar photos. You can also add notes, and choose options to make your photos private, public or shared with specific named users.
Flickr also works with Creative Commons, so users can specify particular licences under which their work can be used or distributed.
Livestreaming is the transmission of footage of a live event over the internet. Users can then watch on their computer through media player software.
Most major television channels will livestream footage via their own in-house media software, such as BBC iPlayer or ITV Player. YouTube is also being increasingly used for this - as was demonstrated recently with Felix Baumgartner's skydive from the edge of space being streamed live in YouTube.