When uploading new site, you want Google to visit your site as soon. For this i can offer the fastest way, to get the spiders know your site, this is an article submitting. Better than having 3-4 social links, better than pings and better than no external links. Suggestion - make external link per each of the main pages of the new site - it worth it. Good luck
To get your website indexed is to verify your website in Google Webmaster tools and submit your XML sitemap through Google Webmaster tools. This is a reliable method and is fast.
Yes indeed when user do article marketing there sites gets index soon or if webmaster make a backlink show in high page rank site than also his website get index immediately