When someone does something on Facebook just to make a point, or have everyone else see it. Can be done by a status, or joining of a group. Usually not a direct comment or wallpost.
Facebook news feed: Brain just became a fan of "Harvard Business School Class of 2014"
Carlos: Man, Brain is such an asshole, he just wants everyone to see that and rub it in their face. He's just conspicuous facebooking like always.
Status: Meg just got a 2400 on her SAT!
Julie: Meg is such a jerk, everyone knows she's a fucking genius, why does she have to gloat all the time?
It's no wonder that when Brayden travelled to the Victorian era, they knew she was from the future. Her cell phone and laptop made her extremely time conspicuous!