But for real, I'm really pissed right now. This problem has only started today and it's most likely because of the winter sale. A lot of people are being randomly brought to other people's account page. This is just ridiculous. **** you Steam.
I doubt this is directly steam's fault, and they're probably trying to get it fixed since it seems like they've blocked logging in to the site. at least, I tried logging in and it won't let me, so I assume they stopped logins while they deal with the issue.
I've tried logging in as well. It would either just refresh the page or not actually log me in. And then when I would try and add something to my cart, it would bring me to someone else's cart.