Maybe I'm showing my age being a geek of the '90s, but an IRC-like chat feature has been on my "fingers-crossed that the Dev team are mind-readers and will roll this out automagically" wishlist for quite a while.
Heck, it was only this morning due to an accidental click that I discovered the paper airplane icon in the top navigation bar leads to a direct messaging client! ;)
While the current messaging system is a nice perk, the necessity of mutual follow-back limits who one can talk with at any given time. Arguably, it is a barrier to organic conversation between folk, especially those who might not normally DM a stranger (lurkers, online introverts, deep listeners, etc.)
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