I agree with Tomastamm. Update your account everyday, add more friends. Make sure that you have all the links that you're promoting in your profile.
do not over submit your link. beware in doing this It should not look like you are spamming. try orkut's promote option .
The best is to utilize the page and group option. You also can make use of their paid online campaigns.
create your page on facebook ,update interesting content every day, recommend it to friend as many as possible
Facebook page is the best thing that you can use it to promote. The others will be groups, ads, or apps.
Add more friends. Create a fan page, also add fbml tag to your fan page. Invite friends to become fan for your site's page you have created. Create a group of you niche. Increase and invite people to join the group.
make an enticing group,app,fanpage for the group/app don't limit your market exposure by creating a simple fan page about your company as a lot of users are not going to join instead ad a debate group of famous people/gendervsgender/sport/gamin/consoles/facebook games/mafiawarsvsfarmiville etc lastly dont spend a brass rassoo with fbads unless you got a coupon that works becareful there to I am currently arguing with facebook over this issue for a working voucher and the pricks tried to charge me with credit left and for the full amount facebook ads team YOU SUCK LOL
To promote your company by facebook, i think you must create fan pages with business category for your business company. Than you can promote your fan pages into your fb friends and paid promote on facebook advertising to increase membership into your fb fan pages. When you have TON's member on your fan pages, you can promote your company by fan page mail, then you can promote your products on fb fan pages with fbml script code...
fan pages are most important you shoild try this on facebook and then make a facebook advertisement that's all thank you