As a picky user, I would like to have the option to remove a box of any website. E.g. I don't like youtube thumbnails (and don't think of youtube as a good resource), so it would be nice to have the option to remove it.

As for implementation, it should be easy to allow users to remove any boxes, right?

PS : As for the clickable round circles, if there is a list with some black circles and others white, it just feels very intuitive to click on a black circle to make it white. It could be that I don't get this because I don't use iOS.