Data privacy has consistently been in the headlines since news of Facebook’s colossal data leak broke in March. That’s when it emerged that the social networking website had sold the data of over 50 million users to Cambridge Analytica, a political data analysis firm.

Because of this leak, Facebook could have, quite literally, used targetted ads to influence the outcome of the 2016 election. As a result, users of the website have been abandoning it in droves, and its founder, Mark Zuckerberg, is being questioned at length by Congress.

However, it turns out that Facebook is not the only major corporation to be exploiting its user’s data. While it’s no secret that Apple’s iPhone has advanced mapping technology, few people know that their phones are keeping track of their every move through a hidden feature.

Check out the video below to find out more:

Introduced in 2013, the Frequent Locations function keeps tabs on where iPhone users go and often they go there. Having accessed the map for myself for the first time today, I was shocked to see the sheer amount of data it had recorded about me without my knowledge.

It’s also worth noting that the map doesn’t just record where you are and when, it even keeps tabs on how long you are specific locations, which is obviously information that could be used maliciously against you if it fell into the wrong hands.

Thankfully, however, it is possible to turn this disturbing feature off.