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It is definitely not internal links within a sites, backlinking consists of links from external sites to your site.

what does do not link site-wide means?? You mean i can only link to  competitors on my home page?

Hi i have several question with regards to mobile optimised site:

1. Does having a mobile optimised site improve ranking in SERP?

2. How can we push/index mobile optimised sites to users searching on mobile sites faster?

e.g. returning m.abc.com or abc.com/m to users seraching on mobile earlier.

It is definitely not internal links within a sites, backlinking consists of links from external sites to your site.