How can we Improve #PageAuthority of any website?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Saurabh Tiwari: How we Improve #PageAuthority of any website?
  Is it Important now days..
• 
  Blade S: Well... you need good SEO overall, but it's mainly about good backlinks. They are the ones that can really influence PA.
• 
  MTOAG Technology: Page Authority, Domain authority, Play very important role for a website. If your PA & DA is above than 30 then it will be very easy to get rank far that domain and page.You can built quality back links, and content should be informative on your website..
   ;Read here ;
  http://moz.com/learn/seo/domain-authority
• 
  I M SEO GUY: We believe page authority is determined by the following:
  1) Internal links
  2) External links
  3) Social signals (google plus ones play a vital role in it)