Trying to figure out a offer for status updates with 3 x 200K fan page sites (niches: comedy, current events, and parody), and offer invites (to fan pages or whereever) of about 400K friends.
You can try to sell your service on BST-> services -> advertising, wait some time and you can go there. If there is people want to buy, they will contact you
Become a member of group related to your website topic. Participate in discussion in it. Post interesting topic in your wall in facebook. You will definitely get more friends.