While Web Services is installed as a module, it's not really a module at all. Once installed, you don't even need to add it to a page. What it does, is it keeps up with all of the karma, rating, ranking, ect... It's also necessary for some of the advanced features that are only included in the Enterprise and Elite editions.

You can explore the following APIs via paths:
http://vivosocial.com/desktopmodules/vivowebservices/profilesearch.asmx
http://vivosocial.com/desktopmodules/vivowebservices/comments.asmx
http://vivosocial.com/desktopmodules/vivowebservices/search.asmx
http://vivosocial.com/desktopmodules/vivowebservices/messaging.asmx