A visual image or representation; painted, sketched, photographed or otherwise placed onto a flat two dimensional surface. Often it is said that a picture is WORTH a thousand words. This is, however, a fairly meager appraisal once one remembers that it is also often said that talk is CHEAP.
A picture doesnt prove anything about a person, it shows the person can pose. Being a poser isnt something to brag about. A video is not much different, a person doesnt have to be themself in a video, so they can pretend to be just about anything.
A picture doesnt tell you anything about who somebody really is, or what they're really like, which is why social media is bullshit.