"White" methods of website promotion

- optimization options for the external White methods of promotion of sites aimed at popularization of the web portal in the first place among the people, without ignoring the laws of the search engines. There are internal and external optimization. If the internal optimization of pages - this is largely correct development of the site, the external - directly increasing the flow of new visitors to the resource and output in the top site. So, what are the methods of external promotion?