wildfire

maastopalo, metsäpalo A rapidly spreading fire, especially one occurring in a wildland area.
puhekieltä Greek fire, Byzantine fire.
A spreading disease of the skin, particularly erysipelas.
puhekieltä Something that acts quickly and uncontrollably.
(quote-journal)|date=18 January 2015|passage=So, it appears a revolution has happened and a very unexpected one. Of course it was only a matter of time before it happened. With WiFi connectivity spreading faster than wildfire and a laptop or tablet in one’s bag, what’s the point of a mobile nowadays?