LinkedIn just fixed one of its most annoying problems

I'm a big LinkedIn user, but for a long time there's one feature that caused me angst because it worked so poorly: Messaging.  The one-to-one communication tool on LinkedIn was completely broken.  I felt like I was constantly losing track of messages because the Inbox section of the site and app didn't allow me to read entire threads at once. For a long time, you couldn't even tell from the Inbox whether or not you had responded to someone's message (the site recently added a "responded" t...