BlueKai, owned by Oracle, deploys these pervasive trackers, sinking its hooks into a reported 1% of the world’s internet traffic. BlueKai is the kind of clever no one really respects. It’s more along the lines of "devious." But it is very, very effective.

BlueKai relies on vacuuming up a never-ending supply of data from a variety of sources to understand trends to deliver the most precise ads to a person’s interests.

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BlueKai… uses more covert tactics like allowing websites to embed invisible pixel-sized images to collect information about you as soon as you open the page — hardware, operating system, browser and any information about the network connection.

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BlueKai can also tie your mobile web browsing habits to your desktop activity, allowing it to follow you across the internet no matter which device you use.

All the information BlueKai grabs has to go somewhere so it can be packaged and sold to marketers. Considering how much data BlueKai is able to obtain about the average internet user, you’d think it would place a premium on keeping this data secure -- if not for the security of unsuspecting trackees, then to prevent its valuable stash from falling into a competitor’s hands.

Unfortunately for a whole lot of internet users, BlueKai doesn’t seem to believe this information -- or the people who generated it -- is worth protecting.

[F]or a time, that web tracking data was spilling out onto the open internet because a server was left unsecured and without a password, exposing billions of records for anyone to find.

Security researcher Anurag Sen found the database and reported his finding to Oracle through an intermediary — Roi Carthy, chief executive at cybersecurity firm Hudson Rock and former TechCrunch reporter.

TechCrunch reviewed the data shared by Sen and found names, home addresses, email addresses and other identifiable data in the database. The data also revealed sensitive users’ web browsing activity — from purchases to newsletter unsubscribes.

Oracle’s response was to blame "two companies" for "not properly configuring their services." The two companies have not been named. Whoever these companies are, they collect data on a wide range of activities. TechCrunch examined the exposed data and found extensive records tied to individuals -- an astonishing pool of data that even indicated if a tracked person’s device was in need of a software update. That’s on top of the wealth of purchase and internet history that linked people to purchases, web searches, and other activity. Sitting in with everything else was personally identifiable info like addresses, phone numbers, and email addresses.

Very few people want all of this information in the hands of marketers. (BlueKai says it strips identifiable info before handing it over to its ad-serving customers.) And they definitely don’t want it in the hands of people even more nefarious than ordained spyware pushers like BlueKai. The company has created a one-stop shop for phishers, stalkers, and identity thieves. And then it left the door unlocked for an undetermined amount of time.