I came across your Facebook page, and I found it very useful and informative. I'm very interested in promoting my website on your page, so I should be pleased if you could let me know of the best way to promote my website, or if you could tell me whom to contact for my website promotion. I look forward to your response.
ABC
[Note: do not say Thank you if you have not received anything. It makes you appear to be humble and obsequious, which I am sure you are not.]