When the comments section on somebody's Facebook status is used to run a real-time conversation between any number of people.
Basically, turning anything posted on somebody's Wall into a chat room through mass amounts of comments directed toward each other.
Usually characterized by having to click "See More" in the feedback to look at all the comments, and responses within seconds of each other.
"Dude, I hate getting 64 updates just because somebody had to turn my wall into a stat room."
"Status: Going to the park in an hour
Best Friend 1: Dude, we never get to have a time anymore!
Best Friend 2: Everyone's coming to my house this Friday!
(Repeat 80 times)"