I could not get your question correctly, but if you want to know about some social media sites which you can use to promote your business, then facebook is no doubt one of the best sites to do that. You can create a fan page on facebook, make quality posts there, quality posts have more changes of being shared by other users, which can in turn increase the popularity of your fan page.
Secondly, you can use twitter as well. Yet another very popular social media site.
And Pinterest is also getting very popular now.