Half of HN personally responsible for doing exactly this kind of thing for a living, shifting in their chair uncomfortably... I umm... just doing my job...
I had a conversation with an exec at a company I worked for in which they expressed pride that our website doesn't track users like those other sites, and I had to break it to them that we heavily used and relied upon every Google ad and analytics product (the latter of which they were obsessed with) and had Facebook "Like" buttons all over the place.
It's easy to go about your daily work and forget about the ways in which you're opted into various data-collection frameworks.
Regarding comments pointing out the Facebook integration on Medium, I think it's okay for people to criticize a system from within the system.
That's not really an excuse. A developer might be asked to implement Facebook tracking code, but a conscientious developer will ensure the browser's "Do Not Track" setting is respected.
It's easy to go about your daily work and forget about the ways in which you're opted into various data-collection frameworks.
Regarding comments pointing out the Facebook integration on Medium, I think it's okay for people to criticize a system from within the system.