Someone who claims to go to a specific event by clicking the "Attending" button on Facebook but never shows up when the actual event takes place. An easy way for one to pretend having a busy social life while actually staying home watching Netflix all time, and a great annoyance to the host of said event.
"Hey, I see you're going to John's party tonight?"
"Nah, I'm just click attending."
"Don't count on Alicia to show up, she's just a click attender"