The question you posted - "Social Media Campaign in your Website" or it should be "for your website".
There are lots of ways and still people are searching for new innovative and unique method to capture audience.
Facebook is very popular for Social Media Campaign for your business or business related website.
Check the link below,http://www.slideshare.net/GinvanglianTombing/how-to-run-social-media-campaigns-on-facebook-13550576
Google to find more. It completely depends on your budget.