The document discusses how stickers on messaging apps have become serious business for brands. It notes that LINE makes $10 million per month from stickers, showing they can be as lucrative as mobile gaming. The redesign of Path to emphasize stickers led to a revenue increase. Paul McCartney gained over 8 million followers on LINE by releasing stickers to promote his new album. The document argues that stickers are successful for brands because people respond to them emotionally like human faces. It provides tips for how brands can integrate stickers, including developing a visual identity, defining the emotional experience, and adapting stickers for different audiences.