Today at 10 a.m. local time at schools across the US, students walked out of class for 17 minutes to protest gun legislation.
Each minute represents one of the 17 victims from the mass shooting last month at Marjory Stoneman Douglas High School in Parkland, FL.
Snapchat, widely preferred by teenagers over other social networks, offers a unique view of the magnitude of the walkouts.
Its Snap Map feature -- also called the "heat map" -- shows numerous stories glowing red about the event.
Stories that glow blue mean that just a few Snaps were taken at a spot.
However, stories that glow red means there are numerous Snap -- aka they are on "fire."