Leverage your use of Facebook, create a list within your friends of those who have 1000+ friends each. Those are your "leverage" list, whom have the most exposure to more people on facebook. A post on a friend with 1000+ friends gives you exposure to all of their friends as well with the (Friend has a new wall post) etc.

No spam, no links to your site, just comment on their profile, their new photo, their videos, their websites, etc. Befriending, not spamming.