User blog comment:The Milkman/Elder Scrolls Online wins "Best RPG of E3 2013"/@comment-86.28.242.195-20130709194955/@comment-5469467-20130710015455

Not really. There are different "channels" of each server that people play in. Playing on one channel means you won't see anyone on another one. There are systems in place to determine which channel is right for you (based upon your preferences versus those of others playing on a particular channel), but you can also switch over yourself.

Or at least, that's my understanding of it.