Fair enough, harborsparrow.@sysprog, You are correct that I miswrote about "giving one's Facebook password to a third party website". But that's a technicality--the result is often the same as if one had shared much of one's Facebook data such as Contact lists with the third party. The password itself is not shared; instead, the OAuth protocol makes sure you are logged into Facebook, then shows the user a little notice (first time used only) about what data will be shared--WHICH NO ONE ACTUALLY READS, or perhaps if they read it, they don't understand it--and then OAuth sends the third-party website a token that the website uses to gain restricted/limited access to some of your account information, usually consisting of your name, email address, gender and so on. The "and so on" is actually, usually, a lot more information. See this article for example: https://www.bbc.com/news/technology-46618582
The problem is, that in order to use third-party website logons via Facebook, you must have enabled, on your Facebook account, the "Apps and Websites" feature, and the DEFAULT behaviors associated with this feature share a whole lot of data about each user. One can further restrict what is shared, to a point, but Facebook is constantly changing the way its Settings feature lets you interact to protect your own data. So, IMO, the only way to safely use Facebook at all is to keep the "Apps and Websites" feature turned off altogether. It is on by default. It is this feature that allowed Cambridge Analytica to mine so much helpful data during the last election cycle, without people realizing it.
For my own part, I stay away from the social media sites (no fb, twit, etc.) and although I use gmail, and sometimes make youtube comments, I don't use google to sign on anywhere else.
You may possibly find it gratifying that the fb interface doesn't always work well --