[MotherJones] Here's How Twitter Can Track You on All of Your Devices

Facebook gets all the bad press, but the bigger threat to your online privacy these days might be your Twitter account. Twitter knows you much better than you may realize. And as it prepares for an IPO, it's taking steps that may allow it to profit from your data in ways that would provoke howls of protest were Mark Zuckerberg to try the same. [...]

Earlier this month, the company announced that it was acquiring MoPub, a middleman that places ads within mobile apps. "The MoPub acquisition allows Twitter to fundamentally change how mobile ads are purchased and places them at the forefront of how mobile, Web, and social ads interact," Antonio Garcia, a former Facebook employee and creator of its FBX real-time ad exchange, wrote on his blog last week. "This makes Twitter the most interesting company in advertising right now."

It also makes Twitter the most interesting challenge to online privacy. But before we get into why, you should understand how MoPub works: [...]