Most of them are the same, which makes sense since most applications are good tools that support business (net)working and collaborating.
Two of my favorite applications are the links with SlideShare and MindMeister. They don’t only offer the possibility to share information in a different and intuitive way, but they are also great for SEO (Search Engine Optimalisation).
They are simple to add, both on LinkedIn and Xing.
Just invest 10 minutes of your time (more of course if you still have to create good slideshows and mindmaps) and in two days you will see what I mean.
To your success !