Facebook, my mother will be proud to know, believes that my friends and I are part of the "Established Adult Life" peer group.

In fact, Facebook knows a lot about how I've grown over the past decade: In 2007, Facebook knew I was declining invitations to college graduation parties and posting screenshots of pictures from Cute Overload to my wall. In 2018, Facebook knows I've clicked on 17 ads since late January for adult-looking work wear, because I can't wear flannels and pants to work forever. And I've clicked on more than a dozen ads for local real estate listings that I will never be able to afford.

Facebook's latest crisis of trust, this time inspired by the Cambridge Analytica news, has led many of its users to realise something very important: Facebook's users are not the customers. They're the product.

As that sinks in, some are choosing to quit the platform. Others are digging into just what it is Facebook knows about them. As it turns out, there's a pretty easy way to find that out in one, giant file.

In the Facebook settings for your account - right below the link to deactivate it - there's an option to download a copy of all your Facebook data. The file can be a creepy wake-up call: All those years of browsing the News Feed, and sharing selfies, engagements and birthday wishes on Facebook have taught the company quite a lot about you. You, the user, are part of the reason that Facebook has become so good at targeting ads. You're giving them everything they need to do it.