Many sites already use the IP address of the browser to serve targetted content, mostly ads (you will have seen the 'Find a Friend in [your city]' banners).

很多站点都已经开始利用浏览器的IP地址来投放相关的内容，这其中主要是广告(比方说你会在页面上看到这样的内容：“来寻找同城好友吧”)。

youdao

The barrage of ads, expected to total in the tens of millions of dollars, is occurring as politicians are struggling to address voters’ most pressing and stubborn concern: the lack of jobs.

接二连三的广告攻势，预计花费达数千万美元，这些宣传试图让广大选民相信，目前最紧迫的事情是工作岗位的短缺。

youdao

The barrage of ads, expected to total in the tens of millions of dollars, is occurring as politicians are struggling to address voters' most pressing and stubborn concern: the lack of jobs.

接二连三的广告攻势，预计花费达数千万美元，这些宣传试图让广大选民相信，目前最紧迫的事情是工作岗位的短缺。

youdao

Users can upload their own information, including recipes, address books and classified ads.

NPR: Google Base Poses a Dilemma for Businesses

Facebook is trying to address this challenge by improving the way ads are targeted to users.

WSJ: Facebook Earnings: Profit Rises Amid Growth in Mobile

Yahoo wants to prove the influence by comparing different ads in similar demographics, and comparing data from a server address, a zip code, and credit card info from a purchase.

FORBES: Yahoo, Kardashian & the Spectrum of Engagement