FYI, you can go directly to messenger.com and avoid seeing the rest of the site entirely. You can also deactivate your Facebook account and leave Messenger (mostly) functional.
Hey, that's handy - thanks! I did have my timeline deleted for a little while, but I reactivated it recently because I needed a couple of extra friend-management features that I couldn't quite get working purely through Messenger. Still, a dedicated Messenger site is super helpful.