That's exactly where the issue is: some people don't read between the lines and ignores hints they don't want to see. Every little interaction between Hinata-Naruto or Sakura-Sasuke is considered romantic, but when it comes to Sakura-Naruto they consider it as friendly/platonic. Which is plain silly, and result in bad argument... Because it renders the romantic hints meaningless if one assumes Naruto-Sakura relationship is sibling or love in a friendly way.
Sakura never hug Lee, yet they are friend. And with Naruto, what's wrong if he is Sakura's friend/best friend? It doesn't mean that the relationship will not evolve into something more. So, you see where the flaw of 'loving in friendly way' argument is?
Back to the topic, NS hints are always subtle, but it is there constantly and mutually comes from both sides. As a start, I'd like to point you to NS manifesto: http://www.narusaku....?showtopic=3524
The hints are everywhere in the manga. All we need to do is to follow what Kishi taught us from the start: to look underneath the underneath.