The image (above), taken from Tomnod, the map search website currently being used by hundreds of thousands of people in an attempt to search for missing plane, was posted on Reddit on Sunday.
The picture appears to show debris from an airplane on the surface of the strait of Malacca, which is where Malaysian radar tracked flight 370 on 8 March.
One user commented: “This matches the 777 perfectly in scale. I made a quick animation with an overlay of the 777.”