Break the misconception that once you have a home recording studio, you can do it all yourself. I perform in a band, and benefit from the expertise of my other group members...
Like the saying goes, "The result is greater than the sum of all of the parts"...
There are several methods to collaborate online with other users using Ardour and Ninjam...
Using Ardour session-exchange
The problem with collaborating online with Ardour is that the files that are generated when you record an auditory product are very LARGE. For example, if you decide to create a zipped tarball (a method to build a single file from a group of directories/files and then compress or "zip" that file to save space) a simple 5 minute song with just percussion and bass guitar could take up between 90 Mb to 120 Mb of hard disk space... Imagine posting that on the cloud, or making available on a distribution server!
Using Ninjam
To be completed...