I play with web and related technologies.. creator of http://expenses.co.in
I will keep it short, I have been using facebook for almost 10 years. I was not addicted but I use to spend almost 15 to 30min on fb everyday.
Lately, I have seen websites adopting only JS approach. Well, good for me, thats what I do! but NO.
Do users care about that? NO!
Do SEO care about that? May be!
I wanted to write this from long, I tweeted about this few months back as well.