Referral traffic is Google's method of reporting visits that came to your site from sources outside of its search engine. When someone clicks on a hyperlink to go to a new page on a different website, Analytics tracks the click as a referral visit to the second site.
I submit the sitemap but after testing from the webmaster it shows that the sitemap is HTML even though I submitted the XML sitemap. So, can you describe the difference between them ?
Link wheel is the best seo technique which gives you lots of backlinks for you website. It is basically interlinking of pages like squidoo, blogger and your home page with the target of getting number of backlinks.