Timeline refresh, "Show new" button, they feel wrong
I've used various social media sites, and navigating the timeline is usually a smooth experience, but the "Show new" button kind of feels... annoying? After I've been scrolling and I go up again, there it is: The button I have to keep clicking. It just feels irritating to have to do it, especially when you've got the live-update-when-scrolled-up feature enabled and you forgot to scroll up, or accidentally touched the mouse wheel.
What I want to have happen is that the top of the timeline is simply updated even when it's out of view, and without weird scrolling glitches occurring while it does this.
To have full control of the layout of the timeline while refreshing it, could it maybe be implemented like a 2D side-scrolling game, where nothing outside of view is rendered, except rotate that concept by 90 degrees? (For all I know, you're already doing this. Just throwing that out there.)