Chatting with People
As usual, I used emails and Slack a lot throughout the day, mostly to schedule meetings and coordinate work, but also to just get in touch with friends. I texted friends with WhatsApp and, despite it claims end-to-end encryption, I also use Signal since it should be a more secure and privacy-focused app. Even if the content of the messages was not collected as plain text, it is most likely that encrypted information was still collected and logged, as well as my GPS position and time of the day.
Moving Around Town
I walked from my dorm to the main campus, but my location has most likely been captured by apps running the background anyway. Later in the day, I took the T to Harvard and my travel got logged when swiping my T pass, while my face got caught from security cameras throughout the station. Throughout the day I also swiped my MIT ID Card to pay for food and access buildings, leaving traces around campus about my location and purchases.
Getting Online
I stayed online for most of the day with my Google account logged in, using a multitude of applications which must have been captured by Google. I also logged into specific websites that require registration such as news sites like The New York Times, Bloomberg but also my MIT and Harvard accounts. Throughout the day I checked social media, scrolling through my feed. This allowed these websites to track a wide range of information, from my position to the links I clicked, posts I liked and videos I watched, adding up to the user profile they already have on me.
Other Things
I am pretty sure there is a whole range of apps and systems collecting my information with me not even realizing it. For instance, I might have granted too many permissions to a few apps, which are collecting a wide range of data even in the background.