National Comics: Rose & Thorn #1

Rose Canton wakes up covered in someone else's blood, and a tattoo on her back saying "Thorn," and no memory of the previous evening. At school, she is told of things she had done that she didn't remember, including making out with Troy Varker the night before, and previously trying to kiss her same-sex friend Melinda. Troy wasn't at school and Rose feared the blood on her may have been his, so she sought him out. In the cab there, she found a friend request on Facelook from "Thorn" who looked like her and posted photos of herself doing things during Rose's gaps in memory.