When Emily Blair Marcus was just 17 years old, she was “serendipitously connected” with a reporter from Us Weekly on social media. From there, her life would forever change. “I had tweeted about a celebrity sighting at an exclusive West Hollywood hotel, and she saw my tweet, and messaged me asking for more details. As it turned out, I had been an eyewitness to that actress’ bridal shower, and the reporter was asking me for fun details to spruce up her story. I essentially sent her a thesis paper over the course of several Twitter DMs, documenting my every memory of the occasion. I ended the me…