There is a difference in concepts: Like and Seo.
Like - is for people you will receive some links. If you like them you enter.
Seo - is for search engines where people search for specifics!
Likes is ... look at this - doesn't mean you want / know about it.
The only suggestion. IF you created a facebook fan page for your business, Use the application called FBML. Make sure you create a custom landing page for your page. Usually linking to your wall is a horrible Idea. We found that out after spending good money with Facebook.
Social media plays a huge role in SEO. It actually inspire customers in a great way and now a days, facebook is on top, so it must be a part of your campaign, for sure.
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SEO is a process to increase the traffic and ranking of your websites using your targeted keywords.
Facebook is a part of SEO, it is use for increase the traffic and popular the product and brand. When you join other communities, groups and users, post your link on their related posts, your connected users are helpful to increase your website traffic.