When several software agents are involved in performing a common unit of work, reinventing AD hoc transaction protocols to achieve state alignment is not necessarily a good idea.

当几个软件代理参与执行一个公共工作单元的时候，重新发明专用事务协议去完成状态调整不是一个好主意。

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First, third party ad networks are not necessarily looking to preserve the unique user experience Twitter has created.

FORBES: Twitter Bans Third-Party Ads

For most social-networking sites, the data identified the profile being viewed but not necessarily the person who clicked on the ad or link.

WSJ: Facebook, MySpace Confront Privacy Loophole

Dennis Roche, president of Access Sports Media, which operates screens hanging in the concourse of 47 professional sports arenas, said he is willing to risk some pricing erosion to get more dollars from ad categories that wouldn't necessarily buy space on his firm's screens.

WSJ: Auction System Helps Place Digital Outdoor Ads