Statistics websites for indexing and for building backlinks
When you add your domain url on statistic websites, it create a new page with your sites online data and these pages are then created and indexed by search engines.
Practically you generate a page for your website with some stats and usually a back link to your site. These links are great for getting your site indexed. If your website is brand new and you need to index your website quickly, this method will help you to get indexed. See an example here: click this link Positions 2 to 10 are statistics websites on which i have a back link. So it's not only for indexing, is for building back links, especially diversity IP back links.