If you've logged in to Facebook today, you'll see a little banner hovering over the homepage, saying “About Ads: Ever wonder how Facebook makes money? Get the Details”. The last part has been embedded with a link, which will take you to a page where you can learn all about Facebook ads, and why they're there. The social network explains how they need to make money in order to stay free for its users, and companies need to advertise, so they pay Facebook to be a platform for them. The important part for Facebook advertising is the last step in the process, that the right person sees the ad.
A little more on Facebook advertising
Yesterday, we reported how Facebook will be embedding Sponsored Stories, which are small ads based on your Friends' activities, in your Newsfeed. While Sponsored Stories already exist in the Ticker and on the homepage on the right hand side, Facebook foresees users getting peeved at the idea of advertisements in their Newsfeed. However, users also need to realize that if they're not paying to use a product, they are the product. Meanwhile, Facebook promises the ads won't be too intrusive.