Facebook

Facebook started out with no ads on their site at all. They used to be very strict about it because a lot of the times, ads ruin websites. Once Facebook got popular, they allowed for ads which is where all of their revenue comes from. Companies have to pay a lot of money in order to advertise on the site. The best way for companies to adeverise on the internet is to use word of mouth and that is essentially what Facebook is. That is why a lot of companies make Facebook pages and links to Facebook from their website, so people can post about it and drive up hits to that company's website and increase that company's sales. Owning an account on Facebook is free and there are no service charges. Facebook plans to make $800 million in revenue from ads that appear on their site.