One thing that has always been interesting to me is to look at people's style. each person has his own style. for example if there is someone on twitter posting art or photos, or own drawings/art, you can always get a sense of the overall style. e.g. certain people like certain colors, or certain motives, or certain characters, etc. or a band has their own style or a game too. i don't really like the word style, maybe there is a better word for it