1. A method comprising: extracting, using a processor and a memory to perform Natural Language Processing (NLP) on a comment to a social media post, an entity that is referenced in the comment, the entity being an object other than a human face that is depicted in an image in the post; analyzing the image to determine whether the entity is represented in the image; computing, responsive to the entity being represented in the image, a sentiment value of the comment relative to the entity; assigning, to a characteristic of a graphical artifact, a value corresponding to the sentiment value; determining a position relative to an area occupied by the entity in the image; causing the graphical artifact to be overlaid on the image at the position and with the value of the characteristic; determining that a set of comments references the entity, the set including the comment; computing a second sentiment value of a second comment in the set of comments; and combining the sentiment value with the second sentiment value to form an overall sentiment value; and using the overall sentiment value as the sentiment value in the assigning.