How Facebook uses Big Data ?
Facebook is worlds biggest social networking site. They track how users interact with the content, for example liking a post. So they have a huge amount of data and this helps them to profile the users interest by using big data. Then these information are used to advertise the products and services that the user is most likely to be interested in. Which make it easly for the advertiser as they can be sure that their Ads are reaching to the potential audience. This confidence of advertiser help facebook in generating a big part of their revenue.