I recently had a spirited discussion with someone about authenticating to various websites. I personally take the approach of making an explicit new identity for every service I sign up for — local logins only. I never user a "Social" login like twitter/facebook/google, etc to access a site.
My reasoning is:
For some background, I'm a ten year professional in Web Infrastructure, with Identity and Access Management making up a decent part of what I do. After pretty much being called an irresponsible professional and told that no identity information will leak due to the way OAUTH works, I thought I'd throw the question out to the community to get a feel for how you handle accounts to different websites, as well as the inherent tracking and security concerns thereof.
Bytram noted that we had a discussion on a similar topic a while back: Personal Privacy in a Surveillance World -- How Important is it? - SoylentNews
(Score: 3, Informative) by Common Joe on Sunday August 09 2015, @02:52PM
Use something like no-script and get rid of your cookies between sessions.
It's amazing how many non-Facebook websites have Facebook javascripts running on their websites. No thank you. I don't know what information they track. By logging into the service on that other website and being logged into Facebook at the same time, they may transfer information between the two.
I do use Facebook to keep in contact with friends around the world. (For some of my friends, it's about the only good way to keep in contact with them. Yes, I know some of you disagree with my choice. But it's my choice.) To help mitigate that, I make sure my cookies are destroyed every time I close out Firefox. (There's a setting for that.) When I'm ready to log into an account that I don't want to be associated with my social networks, I close out Firefox then re-open it. And I make sure the Facebook scripts are not running on those other sites.
Food for though.