I couldn't sleep last night and ended up all night browsing and reading news (all my RSS feed readers, Tumblr, Stumbleupon, NLT, etc.,)
It was really interesting to see that only NLT hosts "bookmark" feature/function right on the HOME page. This is a bit abnormal. Bookmarks and favorites are supposed to be something that only matters to each individual user since it captures user's explicit interests. They are the core of the user model, which is usually presented in the user profile. (That means, it shows up when you click on your login account).
Showing the bookmark button at the home page is nothing fatal. It assumes the more obvious the bookmark button, the more likely the user will bookmark it, update their profile, understand the value of updating profile for personalized news, and read more news, etc., However, there is no data that support any of the above assumptions. On average, there are 60 clicks per month on the button (including both mobile and desktop), and none EdLab users have clicked on the bookmark button just once this year (yes, you heard me right, one click in November).