I recently downloaded the "WordPress Multisite 101" eBook from http://halfelf.org/ebooks/wordpress-multisite-101/ (and yes, I paid for it - money well spent!)
On page 9 of the eBook, it has the following statement:
You should not use www in your URL
A lot of people complain about this. The simple fact is that any well built server will automatically redirect http://www.example.com to example.com seamlessly. By removing it from our install, we avoid any possible conﬂicts with subdomains. Your SEO will not be impacted.
I'm a bit confused by this - why exactly is it a bad idea to use www with the Main Site's URL? Will it actually break multisite or cause specific problems, or is it just a case of "it will work fine but it's not recommended"?
I really want to use www with my Main Site's address, and not by using a redirect either - I want the final URL that is displayed in the browser's Address Bar to use www, and for that to be used in WordPress.
If I'm only running a small WP network, with just a handful of subsites which I have complete control over (I'm the one creating all of the subsites myself - other users won't be able to create their own) - I'm using WP to create a handful of related but distinct sites for a small organisation - if that's the case, then would there be any problem with me using http://www.example.com for the URL of the main site? Obviously I would use that for both the "WordPress Address" and "Site Address" fields in the settings.