Getting away from mundane ads and super spy stuff, there are other worries about what mischief these ID cookies might cause. For example someone might be able to identify and gather information on a person through the associations of the magic cookie and social media. Then far worse than targeted ads would be:
1. the theft of passwords, IDs to use for online theft
2. blackmail because the device user frequents places of ill repute.
For example the identity of the target has been established through cookies. It has been established that the Facebook of the target is big on church, marriage and children.
Then cross referencing determines that the target frequents gambline, porn or alternative sex sites. Even worse. kiddie porn.
Blackmail is very possible.
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