What Mark Zuckerberg didn't say about what Facebook knows about you

If there’s one thing we learned from the past week’s marathon congressional inquisition of Facebook Inc. Chief Executive Mark Zuckerberg, it’s this: The inner workings of Facebook’s data-harvesting behemoth are so byzantine, that in some ways Mr Zuckerberg is just as confused as the rest of us about how it all works.

In his testimony before the US House of Representatives Wednesday, Mr Zuckerberg said Facebook doesn’t store a history of websites its users have visited.

Mr Zuckerberg later corrected himself, saying Facebook does in fact store a list of visited websites that include Facebook’s tracking code. He added that the list is held temporarily before being converted into “a set of ad interests.”

When testifying before the Senate Tuesday, Mr Zuckerberg said, “I think everyone should have control over how their information is used.” He also said, “You have full access to understand all—every piece of information that Facebook might know about you—and you can get rid of all of it.”