I want to use social site for marketing But Social site is best for marketing?
OR you can suggest me about a short list.
This area of SitePoint is reserved for discussions of Content, not Marketing. I would have moved this to the appropriate forum, which is Internet Marketing. However I don't believe that any forum needs another body of lists.
Do a search and I'm sure you'll find many discussions relevant to your topic. Then if you have a specific question that encourages discussion, feel free to post it in the appropriate forum.