- electronic billboards on the bus corner start doing this while walking down the street
- your favorite peacock sitcom starts injecting your friends or recent vacation locations or friends' recent vacation locations on the main character's digital picture frame. Your buddy recently went to Sandals Resort in Jamaica? Now that's going to be emphasized in the unused screen real estate in the background of the bar scene to play on your fomo.
- hell, sporting games already have digital billboards on the field barriers that are customized for different markets / broadcasters... why not customize them further for the individual stream