One of the features that this platform is still not able to provide in my opinion is a quick and easy way to manage memorable responses. I find the way how the platform implements bookmarks too cumbersome and the result not extremely helpful. Below are some older ideas that explain some of the reasons:
How about a simple Bookmark checkbox with every response, similar to the following?
In the Content view of the user profile (My Content), create a new criteria named Bookmark:
The privacy setting should be defined in under User Preferences, such as Private Bookmarks on/off.