Please help me in this i am using currently fb to promote my site and don't know about other could anyone please help me in this...
You're not going to get a valuable answer with such a vague question as that. Search the forums and the web. Then, if you happen to have specific questions, please create another thread.
And if you should repost a question, please be sure you post it in the appropriate forum. Promotion is a part of Internet Marketing. The Content area of SitePoint is about creating content for visitors.
You can find the correct forums for your posts by being sure to read the Important stickied guidelines in each forum as well as the announcments posted at the tops of most forums.