Since you are running Confluence Cloud, this sort of thing is a little more difficult. First of all, Confluence Cloud now allows you to impersonate a user, so if there are not that many people in your organization you could go one by one and add the watches by acting as their user account.
As far as autowatches (for new users) go, I can think of a possible solution, it's just that it doesn't exist yet. You would have to create a Connect Add-on that would call the JSON-RPC API in order to add a space/page/blog watch, and then you could add it to your home page (or to the new dashboard, which is now customizable since yesterday). Then, whenever a user visited that page, they would automatically be added as a watcher to whichever space/page/blog that you desire. This would also take care of having to impersonate users, since all they would have to do is visit the landing page of your Confluence instance and they would be automatically added.
Perhaps there is some feature I am not aware of, but as far as I know that would be one way that it would be possible. Maybe if I get a chance I will write something.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.