Exisiting multisite user signup
I am setting up a multisite where each sub-site is on a subdomain and is a different section of the network like:
1. classifieds (using classipro)
2. jobs (using jobroller)
3. freelance board (using hirebee)
All users are shared between all sites. I've just started working on the job site with Jobroller first and it's a beautiful and very nicely code theme, really love it. But my first issue in my situation is that I need existing users on the network to be able to still sign up as a job seeker or employer without having to create a whole new account.
Is this possible or is there some kind of plugin that will make this work? Any ideas would be much appreciated!