Comments, logging in, etc.

It seems like I am constantly needing to log in to The Verge for commenting. And when I do sign in (generally using the Facebook button) it does not return me to the page I was on.

I would think you would see better utilization of the site if people stayed logged in longer and if the site were more friendly during/after the log in process. Also wouldn't it be better to have an ajax system that can allow users to log in without leaving the page?