I thought about this a lot... so this'll be long. I thought of how bookmarks were used and came up with:

- Things you want easy access to, but have annoying URLs, like your company's wiki page (Solved by Favorites/Bookmarks Bar or Dashboard)

- Things you want to finish looking at later (Solved by Read Later / Reminder)

- Things you want to keep track of, like blogs (Solved by Read Later / Reminder)

- Things you want to be able to find later (Solved by Full Text Search and Tags)

- Something you might want to see again, but not anytime soon (Solved by Personal Archive)

- Something you simply liked or are favoriting (Solved by Personal Archive)

- Note taking / Research (Solved by Tags and Boards)

- Idea inspiration (Solved by Tags and Boards)

- Things you want to show other people (Solved by Social)

- Things you want to get for yourself (Solved by Wishlist)

- Things you want other people to get for you (Solved by Wishlist)

My main problem with using bookmarks was that I rarely went back to them. Normal bookmarks are essentially a personal archive and google search usually finds things much better.

I realized there were a lot of bookmarks I'd like to go back to, I'd just forget about them. Maybe I'd like to read something when I got home from work, or maybe I wanted to check back in a week for an update (or release date), or I wanted to keep a list of items to show someone later (usually funny videos or gifs.) It was pretty difficult to do that no matter how I organized my folders or tagged things.

I eventually built my own bookmark site (https://www.mochimarks.com/landing) with all the features I wanted. The main features (apart from the expected tagging/full text search/browser integration/notes/etc...) were settable/automatic reminders, wishlists, and recommendations. Wishlists let you rank bookmarks. Recommendations could be new stuff from friends or the app could recommend that you look at stuff you liked that you hadn't visited in a while.

After having my app for a while, I've found I use bookmarks a lot more. I mostly use reminders and have a few stuff pop up to check each day. Reminders are killer for me. But when I'm bored I like to sort my wishlists. I don't use tags much... I really only use #Programming, #Interesting (usually really good articles), #Funny, #Music, #Blog, and #ArtBlog. I'll use the recommendation features to check on my blogs and to share links with my friends. I use Read Later a lot, but rarely actually go back and read things later. But when I do, I'm really glad the feature is there.