Earlier quoted context omitted.
It occurs to me--I don't think there's any real "social site" focused on making lists. The closest things we have are social bookmarking tools--but those have a ranking algorithm that highly weights novelty , causing the front page to resemble a stream of ephemeral content mixed with periodic reposts of evergreen content. --- How could we improve on this? [Anyone who wants to do the following is welcome to; I've too…
Letter grades from A - F would be a good idea. Their meaning and use has been ingrained since childhood.
In many countries A - F grading system is not commonly used. For example in the country where I was born they use 1 - 5 grading system and A - F means nothing. I think rating with stars is much more widespread and would be wiser choice for any project with global ambitions.