If you don't happen to be familiar with what it means to 'glo up', it's pretty much the transformation people go through usually after hitting puberty where they go from odd looking weirdos to smoking hot teenagers. It can either be physical or mental, like becoming more confident and accepting yourself more, etc...
A seventeen-year-old girl from Naples, Florida named Caitlin Crowley, decided to spice things up a little bit and add more diversity to this challenge, so she tweeted her own transformation and captioned it "Does this count as a glo up???"
Her transformation is much more different than the previous ones that were available on Twitter at that time, her Tweet included two pictures, the first one is a picture of her and her old friend Dylan who was her boyfriend back at the time, but she clearly looked uncomfortable in that pic and the two didn't look into each other at all, but that's all in the past and they're still good friends. The second pic is definitely not like the first one and she looked much more confident and happy in it while kissing her girlfriend Kirrin Chew, who she started dating over a year ago.
A lot of people absolutely fell in love with her unique tweet and were inspired to submit their own 'coming out glo ups'.