I never understood the "bookmarking" feature that was favoriting. Hearts/likes/kudos are pretty universally accepted as a way of showing support without having to engage with a comment/response. This was long overdo IMO.
Copy/paste the url into another tab, then bookmark it? Favoriting tweets for later review is a substantially more convenient workflow.
So, you favorite it, read the article later and then unfavorite? If you don't unfavorite, how do you differentiate between a bunch of links int he past week that you may/may not have read?
If I want to read something later, I add it to my "Read It Later" service of choice: Pocket.
Dedicated read-it-later services just end up being a list of articles I haven't read and feel bad about.
It used to be for me, too. Now I'm much more loose about marking something as read without reading it.
I often thought "This is a good tweet... but why should I favorite something on Twitter?!"