1. A method for detecting an event via social media content, the method comprising: obtaining multiple images from at least one social media source; extracting at least one visual semantic concept from the multiple images; differentiating an event semantic concept signal from a background semantic concept signal to detect an event in the multiple images; and retrieving one or more images associated with the event semantic concept signal for presentation as a visual description of the detected event; wherein at least one of the steps is carried out by a computer device.