I can't tell if you're contradicting yourself here or not. Yes, I know they're using these services to vet logins for them, but your accusation that I don't understand what they've done goes against your assertion that you're always being tracked... So I don't understand because they don't actually know you're logging in when you log in through them? You're saying I'm assuming tracking is going on... then you stated it always is, so I'm not sure what point you're trying to make, unless it's that we're all already beaten so we should just give up and let everyone see everything?
But to bring it back, the problem is that you're not just being tracked by easily defeated semi-anonymous usage trackers that could only know you through correlation of disparate datums - you're going "hey, (third party): I, (first name, last name, user history) would like to log into this site now..." and all of the choices are companies that make their fortune off analyzing customers to sell them shit on behalf of advertisers. It's like showing your driver's license to shop at a convenience store. It doesn't become alright because you can make a dummy account and cheat the system.
It's really ridiculous to think this is a problem because it's Gawker. I'd say it's completely backwards - it's a problem because it's not Gawker. Actually, I don't see why I should retype it all...
To paraphrase, it's not cool when sites - whether or not Gawker has anything to do with them - require you to sign in through the private entities most commonly cited as "big brother."
For the record, Gawker was hacked... Also, a Google engineer stalked some kids, Twitter got owned, and while Facebook has been hacked here and there, its name is synonymous with arbitrarily redefining their privacy policies and oversharing users' data - the most infamous of which... involved sharing user data with third parties!
So yeah... I think you're either jumping to their defense with tenacity you wouldn't expect from a non-employee, or you must not understand the difference between data mining by one of many media companies vs the biggest players on the Internet, or the difference between "anonymous" data and logging in directly with a personal user account that usually includes your real name and other personal info collected through its use. It's an invasive practice, and being able to hide from it or outsmart it doesn't make it fine for everyone, even if you're personally ok with it.