A coworker and an ember / angular troll recently claimed that Ember and any single page framework sucks when it comes to SEO. I honestly never gave this much thought so I quickly poked around online. I found things like Prentender.io and a few others that help out with that.
Whats the most common way to handle SEO?
https://developers.google.com/webmasters/ajax-crawling/
That is for #! urls.
If you look at discourse, they put a no script tag in the page with a dump of the html in it. All links do have an html dump. So google can index those without problem.
The only thing with SEO is that you have to plan for it. Most single page app are behind a login wall so it is not as relevant.