They’re almost invisible but contain a hidden code – and now their presence on a leaked document has sparked speculation about their usefulness to FBI investigators.
An AOL researcher inadverntly released a database of 21 million search queries to the Web. It's been snagged and is providing a valuable trove of sociological search behavior ... and potential privacy intrusion if the ID numbers are ever associated with u
"Airsage has taken it to the next level in the more recent past with GPS based anonymized data, but data with EXTENSIVE history. The Airsage product is zip code and smaller resolution and can provide months to years of location history of an anonymous cell phone id. " -- https://news.ycombinator.com/item?id=14803443
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