For more context, that this website can rank papers based on their Twitter mentions is only one of the features. It also let's you bookmark papers, and it has a pretty good similarity engine that recommends similar papers.
It is also Andrej Karpathy's (head of AI at Tesla) open source side project.
I agree that some people would prefer to see this as a weekly popup, but some people have the habit of taking a look at what is happening every day :-)