WHO IS 15OVER15?

From LGpedia (http://www.lg15.com/lgpedia/index.php?title=15over15):

15over15 is a mysterious character in the Maddison Atkins ARG. While assumed to be in the Resistance (like Linc ), it is unknown what side this person is on. Their YouTube account was first discovered after Linc told us that he had recieved a call. When we called the number, we heard a music mashup puzzle. After going through all the answers, the fraction 15/15 was the answer, and the account 15over15 was found.
In the YouTube description, 15over15 tells Linc to protect Rachel (presumably from the Order), but she also tells Clara Stokes to keep her camera rolling (which she did, posting many videos in one day).
15over15 only has one video, appropriately titled 15OVER15. It is six seconds long, and is not very clear, except for the fact that it says "15over15" at the end.