Sometimes, choose the system hard to get links, or simply do not know any efficient way to purchase options you specified. For this case, the statistics come. Not always the best system is one in which most sites or advertisers. In seo goes that way, unless of course it's not a new system of the Stock Exchange of links, blogs and articles. The number of sites through search differs from that of the main page. In some markets, if a site is deleted, this number no one holds, and eventually many absences. Consequently, the actual number of sites less. Also sites that do not have availability in the search are not displayed, so there may be an understatement. I think that some exchanges may cheat the amount of content in the system on the main pages. Count the exact number of information sites, all options exchanges post, folded them, will not work, since many webmasters add sites to multiple exchanges links. Also added some stockbrokers second-level domain , and third-level domains are added to a few other options exchanges. I think that is better to buy links from domains 2nd level. Buy links to the site on the Exchange is very simple, the main thing - to choose the right site, how many links to buy - you can choose yourself, with the amount should not be a problem. on http://www.wheretoget-backlinks.com/r/buy_backlinks.html