这种广告模式在会计师，律师，管道工人以及其他服务提供者中特别受欢迎。 他们发现这种方式能够更加容易地完成一项交易。
This is especially popular among accountants, lawyers, plumbers and other service providers who find it easier to close a deal on the telephone.
同样的情况也适用于广告、电子邮件、YouTube和我们的其他服务：理解人与社交图，就能让他们所有人都更上层楼。
The same goes for ads, email, YouTube, and our other services: Understanding people and the social graph can make all of them better.
并且，自然也存在有盈利模式，其基础在于：我们提供了一项服务或者一个产品，你之所以要付费是因为你喜欢它，又或者广告主会给我们支付费用，又或者是其他的津贴办法。
And of course there is the for-profit model, which basically is: we provide a service or a product and you pay us because you like it or advertisers pay us or some subsidy method.
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