Widget to make scrolling function

I wanted to have a plugin that will show all the comments, posts, tweets, etc on the side bar, but I what I hated the most was having a certain amount of numbers specified so it makes the website look good.

Is their a plugin where, it’s similar to gizmodo where you can scroll downwards and it will scroll down through a list? Instead of having a super long website?

Hope you understood what I am talking about, thanks.