The Hidden Things Your Apps Know

November 15, 2017

Your apps, search engines and social networks know hidden things about you that even your closest friends might not. To find out just how much, Sophia Smith Galer tries a programme called the Data Detox.

I was dubious at first when I read about the Data Detox. It sounds like a guide to logging off, but as somebody whose job requires me to be online almost all of the time, that could be professional suicide. But that is not the aim of this eight-day programme; it’s more about exploring and tidying up your digital life.

It was designed by the non-profit groups Mozilla and the Tactical Technology Collective to coincide with The Glass Room, a pop-up experience in London that invited visitors to look at what happens to their data behind the scenes. They recognise that we can’t transform years of online behaviour – instead, the Detox is about trying to help us make more informed data choices in the future.

“In less than half an hour every day, over the course of eight days, people can slim down their ‘data bloat’ with easy, practical steps,” the curators of The Glass Room told me. “We hope that the Data Detox Kit will help people think differently about data collection.”

Intrigued, I decided to give their kit a go, which you can also do yourself here. Here’s what I found out.


The first day is, essentially, about scaring you into realising how much of you is online via search engines. As an online journalist – and a millennial – it turns out a lot of my life is online, and it’s something I’m generally OK with. By clearing your browsing history, you can Google yourself as if you were a stranger; that way, you can see the sort of images and links that are associated with you online. I’m happy with my results, but that’s because I’m responsible for putting almost all of the content on there myself.

Nothing too alarming turned up until I started experimenting with alternative search engines. DuckDuckGo is a non-commercial site, meaning that unlike Google it has no interest in collecting information from your search history or providing you with personalised results (and so using it reduces your data bloat). It does, however, autocomplete your sentences using other sources, notably Yahoo, Bing and Yandex. While Google tried to finish my search entry saying ‘Sophia Smith Galer BBC’, DuckDuckGo suggested ‘Sophia Smith Galer liberal’.

I can speculate fairly wildly about why someone, at some point, searched for that; is it who I work for, the sort of pieces I write, that one time I got hounded on Reddit? Who knows. But it did shed some light on the influence of what other people’s search entries can make on my digital self, and that’s quite disarming.


‘Is Google your BFF?’, the Data Detox innocuously asks. Look, I know I’m online a lot, but I do have an offline life too, thank you very much.

It turns out that, in reality, Google is my BFF. The Detox asks you what information you share with Google, and then asks if you would also share that information with your best friend. I use Chrome, Docs, Gmail, Translate, YouTube and Maps, which means – and this is where you take a deep breath –  I’m telling Google where I am, what device I’m using, what I’m curious about, what I’m working on, what I’m emailing people, which bank, doctor and phone provider I use, the sort of words I don’t know in other languages, my guilty pleasures, what I’m learning to do, what I like to listen to, where I’ve been in the past, how often I’m there and my journeys. My best friend knows a lot about me, but she doesn’t know that much.

I also don’t have an Android phone – if you do, your recorded audio search requests are also being logged. So, Google knows what your voice sounds like too.

You can delete the activity that Google stores, which the Detox tells you how to do.


This day was quite interesting because I realised how much I’m not really posting on Facebook at all anymore. The ‘context collapse’ that started to worry the social media company last year has meant that I’m unconsciously categorising what I post and where, and while as 12-year-olds my friends and I were posting everything that we did onto our Facebook walls, I’m now posting pictures of what I did last night or ate this morning to Instagram and posting news articles or observations onto Twitter.

For many, this has left a digital graveyard of embarrassing childhood posts and photographs on your Facebook profile. Is it time to untag yourself, or ask friends to take things down?


Every time you ‘Like’ something on Facebook and Twitter, you’re letting third party companies know the pages you visit, what you like to click and your IP address through trackers. Those are just the visible trackers, too; there are plenty of invisible ones also monitoring your online behaviour. If a company has trackers across lots of websites, they can get an excellent impression of your browsing habits.

Your default privacy settings aren’t too private to begin with, so the Detox advises how you might adjust them, or instead set your browsing mode to Private, such as on Safari, or to Chrome’s Incognito to stop your search history from being stored. Add-ons and extensions can also be downloaded which stop invisible trackers from spying on you. When visiting websites, starting the URL with ‘https’ rather than ‘http’ additionally makes sure that your communication is encrypted.

The Detox, however, makes one warning: “Private/Incognito browsing just prevents you sharing certain things with trackers and websites; it doesn’t make you anonymous on the internet!”

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