Facebook’s Autoplay feature, which starts playing videos automatically in your feed, could jack up your wireless bill. New data from web monitoring firm Sandvine offers an inkling of how much might be at stake — for your pocketbook and the ever-increasing traffic load on the web. Sandvine has noticed that in the previous year, Facebook traffic increased by 60 percent on one mobile network, and by over 200 percent on one fixed wireline network, driven by people’s Facebook feeds’ video auto plays. Facebook started rolling out the feature last September. The problem with Autoplay has been noticed before, but the theory is that a glut of ice bucket challenge videos has led to a marked rise in video content that might be playing, and thus, a rise in data usage.