Abstract: A computer-based method includes classifying motion in a video file using a classifier to produce a confidence score for the video file that indicates how confident the classifier is that motion in the video file is a particular type of motion (e.g., motion by a living being). The method further includes enabling a first human user to specify (e.g., with a slider-style graphical control element), from a first user computing device, a first threshold confidence score for receiving notifications about videos. The method further includes sending a first notification of the uploaded video file if the confidence score for the video file meets or exceeds the user-specified first threshold confidence score for receiving notifications about videos. The first notification, if sent, is accessible at least from the first user computing device.