Even in talking with my own daughter, currently a high school sophomore, she described to me a number of decisions that she makes including the intended receiver (whether the person is a close friend, acquaintance, boyfriend, or adult; the likelihood that the receiver will save or share the snap with others), the time (time of day, day of the week, month, during the school year or during vacation), the location (inside/outside, at home/elsewhere), the lighting, the font size and color, use of emojis or other “stickers,” duration of the conversation (and whether it is part of a “Snap Streak” of multiple days), and whether or not to use time and location tags provided by Snapchat.
This example reminds me of the high school student who is unable to solve a simple math problem in a remedial class. Yet, that same student can build an entire off-road vehicle and converse fluently about fuel ratios, timing settings, and torque tolerance.